52390739 has 4 divisors (see below), whose sum is σ = 52704624. Its totient is φ = 52076856.

The previous prime is 52390729. The next prime is 52390747. The reversal of 52390739 is 93709325.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52390739 is a prime.

It is a super-2 number, since 2×52390739² = 5489579065932242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (52390729) 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, 156692 + ... + 157025.

It is an arithmetic number, because the mean of its divisors is an integer number (13176156).

Almost surely, 2^52390739 is an apocalyptic number.

52390739 is a deficient number, since it is larger than the sum of its proper divisors (313885).

52390739 is a wasteful number, since it uses less digits than its factorization.

52390739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313884.

The product of its (nonzero) digits is 51030, while the sum is 38.

The square root of 52390739 is about 7238.1447208522. The cubic root of 52390739 is about 374.1836796866.

The spelling of 52390739 in words is "fifty-two million, three hundred ninety thousand, seven hundred thirty-nine".