56404909 has 8 divisors (see below), whose sum is σ = 63196128. Its totient is φ = 49890960.

The previous prime is 56404897. The next prime is 56404927. The reversal of 56404909 is 90940465.

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

It is a cyclic number.

It is not a de Polignac number, because 56404909 - 2⁵ = 56404877 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56404009) 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, 68887 + ... + 69700.

It is an arithmetic number, because the mean of its divisors is an integer number (7899516).

Almost surely, 2^56404909 is an apocalyptic number.

It is an amenable number.

56404909 is a deficient number, since it is larger than the sum of its proper divisors (6791219).

56404909 is a wasteful number, since it uses less digits than its factorization.

56404909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138635.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 56404909 is about 7510.3201662779. The cubic root of 56404909 is about 383.5061218933.

The spelling of 56404909 in words is "fifty-six million, four hundred four thousand, nine hundred nine".