155861408 has 48 divisors (see below), whose sum is σ = 324324000. Its totient is φ = 73527552.

The previous prime is 155861383. The next prime is 155861413. The reversal of 155861408 is 804168551.

It is a Harshad number since it is a multiple of its sum of digits (38).

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, 236183 + ... + 236841.

It is an arithmetic number, because the mean of its divisors is an integer number (6756750).

Almost surely, 2^155861408 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 155861408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162162000).

155861408 is an abundant number, since it is smaller than the sum of its proper divisors (168462592).

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

155861408 is a wasteful number, since it uses less digits than its factorization.

155861408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1077 (or 1069 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 38.

The square root of 155861408 is about 12484.4466437243. The cubic root of 155861408 is about 538.1617972664.

The spelling of 155861408 in words is "one hundred fifty-five million, eight hundred sixty-one thousand, four hundred eight".