72389947 has 24 divisors (see below), whose sum is σ = 87754464. Its totient is φ = 58485504.

The previous prime is 72389923. The next prime is 72389953. The reversal of 72389947 is 74998327.

It is not a de Polignac number, because 72389947 - 2⁷ = 72389819 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72389947.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72389147) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 418353 + ... + 418525.

It is an arithmetic number, because the mean of its divisors is an integer number (3656436).

Almost surely, 2^72389947 is an apocalyptic number.

72389947 is a deficient number, since it is larger than the sum of its proper divisors (15364517).

72389947 is a wasteful number, since it uses less digits than its factorization.

72389947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339 (or 316 counting only the distinct ones).

The product of its digits is 762048, while the sum is 49.

The square root of 72389947 is about 8508.2281939309. The cubic root of 72389947 is about 416.7664521187.

The spelling of 72389947 in words is "seventy-two million, three hundred eighty-nine thousand, nine hundred forty-seven".