56405243 has 4 divisors (see below), whose sum is σ = 59373960. Its totient is φ = 53436528.

The previous prime is 56405231. The next prime is 56405249. The reversal of 56405243 is 34250465.

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 56405243 - 2⁸ = 56404987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56405249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1484330 + ... + 1484367.

It is an arithmetic number, because the mean of its divisors is an integer number (14843490).

Almost surely, 2^56405243 is an apocalyptic number.

56405243 is a deficient number, since it is larger than the sum of its proper divisors (2968717).

56405243 is a wasteful number, since it uses less digits than its factorization.

56405243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2968716.

The product of its (nonzero) digits is 14400, while the sum is 29.

The square root of 56405243 is about 7510.3424023143. The cubic root of 56405243 is about 383.5068788652.

The spelling of 56405243 in words is "fifty-six million, four hundred five thousand, two hundred forty-three".