72397157 has 12 divisors (see below), whose sum is σ = 84559500. Its totient is φ = 61802496.

The previous prime is 72397153. The next prime is 72397181. The reversal of 72397157 is 75179327.

It can be written as a sum of positive squares in 2 ways, for example, as 36409156 + 35988001 = 6034^2 + 5999^2 .

It is not a de Polignac number, because 72397157 - 2² = 72397153 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72397153) 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 11 ways as a sum of consecutive naturals, for example, 9719 + ... + 15467.

It is an arithmetic number, because the mean of its divisors is an integer number (7046625).

Almost surely, 2^72397157 is an apocalyptic number.

It is an amenable number.

72397157 is a deficient number, since it is larger than the sum of its proper divisors (12162343).

72397157 is a wasteful number, since it uses less digits than its factorization.

72397157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6020 (or 6013 counting only the distinct ones).

The product of its digits is 92610, while the sum is 41.

The square root of 72397157 is about 8508.6518908697. The cubic root of 72397157 is about 416.7802882313.

The spelling of 72397157 in words is "seventy-two million, three hundred ninety-seven thousand, one hundred fifty-seven".