72389994 has 16 divisors (see below), whose sum is σ = 146134368. Its totient is φ = 23904272.

The previous prime is 72389983. The next prime is 72390007. The reversal of 72389994 is 49998327.

It is a super-2 number, since 2×72389994² = 10480622462640072, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 55737 + ... + 57020.

It is an arithmetic number, because the mean of its divisors is an integer number (9133398).

Almost surely, 2^72389994 is an apocalyptic number.

72389994 is an abundant number, since it is smaller than the sum of its proper divisors (73744374).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72389994 is a wasteful number, since it uses less digits than its factorization.

72389994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112869.

The product of its digits is 979776, while the sum is 51.

The square root of 72389994 is about 8508.2309559626. The cubic root of 72389994 is about 416.7665423155.

The spelling of 72389994 in words is "seventy-two million, three hundred eighty-nine thousand, nine hundred ninety-four".