55399697 has 4 divisors (see below), whose sum is σ = 57186816. Its totient is φ = 53612580.

The previous prime is 55399679. The next prime is 55399727. The reversal of 55399697 is 79699355.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55399697 - 2⁸ = 55399441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55399637) 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, 893513 + ... + 893574.

It is an arithmetic number, because the mean of its divisors is an integer number (14296704).

Almost surely, 2^55399697 is an apocalyptic number.

It is an amenable number.

55399697 is a deficient number, since it is larger than the sum of its proper divisors (1787119).

55399697 is a wasteful number, since it uses less digits than its factorization.

55399697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1787118.

The product of its digits is 2296350, while the sum is 53.

The square root of 55399697 is about 7443.0972719695. The cubic root of 55399697 is about 381.2142529594.

The spelling of 55399697 in words is "fifty-five million, three hundred ninety-nine thousand, six hundred ninety-seven".