55431407 has 8 divisors (see below), whose sum is σ = 59263776. Its totient is φ = 51662592.

The previous prime is 55431391. The next prime is 55431413. The reversal of 55431407 is 70413455.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55431407 - 2⁴ = 55431391 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55431407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55431307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14078 + ... + 17579.

It is an arithmetic number, because the mean of its divisors is an integer number (7407972).

Almost surely, 2^55431407 is an apocalyptic number.

55431407 is a deficient number, since it is larger than the sum of its proper divisors (3832369).

55431407 is a wasteful number, since it uses less digits than its factorization.

55431407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31777.

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 55431407 is about 7445.2271288390. The cubic root of 55431407 is about 381.2869729618.

The spelling of 55431407 in words is "fifty-five million, four hundred thirty-one thousand, four hundred seven".