155438856 has 96 divisors (see below), whose sum is σ = 431308800. Its totient is φ = 50561280.

The previous prime is 155438849. The next prime is 155438873. The reversal of 155438856 is 658834551.

It is a super-2 number, since 2×155438856² = 48322475909177472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 813721 + ... + 813911.

It is an arithmetic number, because the mean of its divisors is an integer number (4492800).

Almost surely, 2^155438856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155438856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (215654400).

155438856 is an abundant number, since it is smaller than the sum of its proper divisors (275869944).

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

155438856 is a wasteful number, since it uses less digits than its factorization.

155438856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419 (or 412 counting only the distinct ones).

The product of its digits is 576000, while the sum is 45.

The square root of 155438856 is about 12467.5120212495. The cubic root of 155438856 is about 537.6750247388.

The spelling of 155438856 in words is "one hundred fifty-five million, four hundred thirty-eight thousand, eight hundred fifty-six".