1919155420 has 288 divisors, whose sum is σ = 5505712128. Its totient is φ = 546061824.

The previous prime is 1919155373. The next prime is 1919155457. The reversal of 1919155420 is 245519191.

It is a super-2 number, since 2×1919155420² = 7366315052230752800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1919155420.

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 95 ways as a sum of consecutive naturals, for example, 15111397 + ... + 15111523.

It is an arithmetic number, because the mean of its divisors is an integer number (19117056).

Almost surely, 2^1919155420 is an apocalyptic number.

1919155420 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 1919155420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2752856064).

1919155420 is an abundant number, since it is smaller than the sum of its proper divisors (3586556708).

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

1919155420 is a wasteful number, since it uses less digits than its factorization.

1919155420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217 (or 196 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 37.

The square root of 1919155420 is about 43808.1661337244. The cubic root of 1919155420 is about 1242.7107321509.

The spelling of 1919155420 in words is "one billion, nine hundred nineteen million, one hundred fifty-five thousand, four hundred twenty".