55402539 has 4 divisors (see below), whose sum is σ = 73870056. Its totient is φ = 36935024.

The previous prime is 55402531. The next prime is 55402553. The reversal of 55402539 is 93520455.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55402539 - 2³ = 55402531 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55402531) 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, 9233754 + ... + 9233759.

It is an arithmetic number, because the mean of its divisors is an integer number (18467514).

Almost surely, 2^55402539 is an apocalyptic number.

55402539 is a deficient number, since it is larger than the sum of its proper divisors (18467517).

55402539 is a wasteful number, since it uses less digits than its factorization.

55402539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18467516.

The product of its (nonzero) digits is 27000, while the sum is 33.

The square root of 55402539 is about 7443.2881846668. The cubic root of 55402539 is about 381.2207716014.

The spelling of 55402539 in words is "fifty-five million, four hundred two thousand, five hundred thirty-nine".