72389427 has 32 divisors (see below), whose sum is σ = 109396224. Its totient is φ = 42192000.

The previous prime is 72389389. The next prime is 72389437. The reversal of 72389427 is 72498327.

It is not a de Polignac number, because 72389427 - 2⁸ = 72389171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72389437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 123028 + ... + 123614.

It is an arithmetic number, because the mean of its divisors is an integer number (3418632).

Almost surely, 2^72389427 is an apocalyptic number.

72389427 is a deficient number, since it is larger than the sum of its proper divisors (37006797).

72389427 is a wasteful number, since it uses less digits than its factorization.

72389427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 739.

The product of its digits is 169344, while the sum is 42.

The square root of 72389427 is about 8508.1976352222. The cubic root of 72389427 is about 416.7654541944.

Subtracting 72389427 from its reverse (72498327), we obtain a square (108900 = 330²).

The spelling of 72389427 in words is "seventy-two million, three hundred eighty-nine thousand, four hundred twenty-seven".