56042409 has 4 divisors (see below), whose sum is σ = 74723216. Its totient is φ = 37361604.

The previous prime is 56042401. The next prime is 56042417. The reversal of 56042409 is 90424065.

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 an interprime number because it is at equal distance from previous prime (56042401) and next prime (56042417).

It is not a de Polignac number, because 56042409 - 2³ = 56042401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56042401) 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, 9340399 + ... + 9340404.

It is an arithmetic number, because the mean of its divisors is an integer number (18680804).

Almost surely, 2^56042409 is an apocalyptic number.

It is an amenable number.

56042409 is a deficient number, since it is larger than the sum of its proper divisors (18680807).

56042409 is a wasteful number, since it uses less digits than its factorization.

56042409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18680806.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 56042409 is about 7486.1478077847. The cubic root of 56042409 is about 382.6827901596.

The spelling of 56042409 in words is "fifty-six million, forty-two thousand, four hundred nine".