52155440 has 20 divisors (see below), whose sum is σ = 121261584. Its totient is φ = 20862144.

The previous prime is 52155407. The next prime is 52155449. The reversal of 52155440 is 4455125.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (52155449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 325892 + ... + 326051.

Almost surely, 2^52155440 is an apocalyptic number.

It is an amenable number.

52155440 is an abundant number, since it is smaller than the sum of its proper divisors (69106144).

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

52155440 is a wasteful number, since it uses less digits than its factorization.

52155440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651956 (or 651950 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 52155440 is about 7221.8723334050. The cubic root of 52155440 is about 373.6226569596.

The spelling of 52155440 in words is "fifty-two million, one hundred fifty-five thousand, four hundred forty".