1878840 has 96 divisors (see below), whose sum is σ = 6486480. Its totient is φ = 470016.

The previous prime is 1878839. The next prime is 1878841. The reversal of 1878840 is 488781.

1878840 = 112² + 113² + ... + 191².

It is an interprime number because it is at equal distance from previous prime (1878839) and next prime (1878841).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1878795 and 1878804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1878841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5967 + ... + 6273.

2^1878840 is an apocalyptic number.

1878840 is a gapful number since it is divisible by the number (10) 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 1878840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3243240).

1878840 is an abundant number, since it is smaller than the sum of its proper divisors (4607640).

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

1878840 is a wasteful number, since it uses less digits than its factorization.

1878840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341 (or 334 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 1878840 is about 1370.7078463334. The cubic root of 1878840 is about 123.3947263537.

The spelling of 1878840 in words is "one million, eight hundred seventy-eight thousand, eight hundred forty".