155293440 has 144 divisors (see below), whose sum is σ = 509839008. Its totient is φ = 40255488.

The previous prime is 155293433. The next prime is 155293451. The reversal of 155293440 is 44392551.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141534 + ... + 142626.

Almost surely, 2^155293440 is an apocalyptic number.

155293440 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 155293440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254919504).

155293440 is an abundant number, since it is smaller than the sum of its proper divisors (354545568).

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

155293440 is a wasteful number, since it uses less digits than its factorization.

155293440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1154 (or 1140 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 155293440 is about 12461.6788596080. The cubic root of 155293440 is about 537.5073040291.

The spelling of 155293440 in words is "one hundred fifty-five million, two hundred ninety-three thousand, four hundred forty".