155884440 has 64 divisors (see below), whose sum is σ = 470302560. Its totient is φ = 41333760.

The previous prime is 155884439. The next prime is 155884451. The reversal of 155884440 is 44488551.

It is a super-2 number, since 2×155884440² = 48599917268227200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18132 + ... + 25308.

Almost surely, 2^155884440 is an apocalyptic number.

155884440 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 155884440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235151280).

155884440 is an abundant number, since it is smaller than the sum of its proper divisors (314418120).

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

155884440 is a wasteful number, since it uses less digits than its factorization.

155884440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7372 (or 7368 counting only the distinct ones).

The product of its (nonzero) digits is 102400, while the sum is 39.

The square root of 155884440 is about 12485.3690373973. The cubic root of 155884440 is about 538.1883044310.

The spelling of 155884440 in words is "one hundred fifty-five million, eight hundred eighty-four thousand, four hundred forty".