72109389 has 24 divisors (see below), whose sum is σ = 110715552. Its totient is φ = 41395680.

The previous prime is 72109363. The next prime is 72109397. The reversal of 72109389 is 98390127.

It is not a de Polignac number, because 72109389 - 2⁵ = 72109357 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72109339) 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, 8887 + ... + 14939.

It is an arithmetic number, because the mean of its divisors is an integer number (4613148).

Almost surely, 2^72109389 is an apocalyptic number.

It is an amenable number.

72109389 is a deficient number, since it is larger than the sum of its proper divisors (38606163).

72109389 is a wasteful number, since it uses less digits than its factorization.

72109389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6105 (or 6086 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 72109389 is about 8491.7247364714. The cubic root of 72109389 is about 416.2273416050.

The spelling of 72109389 in words is "seventy-two million, one hundred nine thousand, three hundred eighty-nine".