1878389856 has 432 divisors, whose sum is σ = 6740042400. Its totient is φ = 485388288.

The previous prime is 1878389839. The next prime is 1878389861. The reversal of 1878389856 is 6589838781.

It is a super-2 number, since 2×1878389856² = 7056696902247401472, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 1878389793 and 1878389802.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 21105460 + ... + 21105548.

It is an arithmetic number, because the mean of its divisors is an integer number (15601950).

Almost surely, 2^1878389856 is an apocalyptic number.

1878389856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1878389856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3370021200).

1878389856 is an abundant number, since it is smaller than the sum of its proper divisors (4861652544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1878389856 is a wasteful number, since it uses less digits than its factorization.

1878389856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179 (or 149 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 63.

The square root of 1878389856 is about 43340.3951989365. The cubic root of 1878389856 is about 1233.8487101172.

The spelling of 1878389856 in words is "one billion, eight hundred seventy-eight million, three hundred eighty-nine thousand, eight hundred fifty-six".