56423729 has 4 divisors (see below), whose sum is σ = 56492784. Its totient is φ = 56354676.

The previous prime is 56423693. The next prime is 56423737. The reversal of 56423729 is 92732465.

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 56423729 - 2¹² = 56419633 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 56423692 and 56423701.

It is not an unprimeable number, because it can be changed into a prime (56423929) 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, 33287 + ... + 34940.

It is an arithmetic number, because the mean of its divisors is an integer number (14123196).

Almost surely, 2^56423729 is an apocalyptic number.

It is an amenable number.

56423729 is a deficient number, since it is larger than the sum of its proper divisors (69055).

56423729 is an equidigital number, since it uses as much as digits as its factorization.

56423729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69054.

The product of its digits is 90720, while the sum is 38.

The square root of 56423729 is about 7511.5730043713. The cubic root of 56423729 is about 383.5487705608.

The spelling of 56423729 in words is "fifty-six million, four hundred twenty-three thousand, seven hundred twenty-nine".