438155920 has 40 divisors (see below), whose sum is σ = 1020381120. Its totient is φ = 174975360.

The previous prime is 438155917. The next prime is 438155951. The reversal of 438155920 is 29551834.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×438155920² = 383961220462092800, 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 438155920.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48565 + ... + 56875.

It is an arithmetic number, because the mean of its divisors is an integer number (25509528).

Almost surely, 2^438155920 is an apocalyptic number.

438155920 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

438155920 is an abundant number, since it is smaller than the sum of its proper divisors (582225200).

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

438155920 is a wasteful number, since it uses less digits than its factorization.

438155920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8983 (or 8977 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 438155920 is about 20932.1742778910. The cubic root of 438155920 is about 759.5264362809.

The spelling of 438155920 in words is "four hundred thirty-eight million, one hundred fifty-five thousand, nine hundred twenty".