72431939 has 2 divisors, whose sum is σ = 72431940. Its totient is φ = 72431938.

The previous prime is 72431929. The next prime is 72431941. The reversal of 72431939 is 93913427.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72431939 - 2⁴ = 72431923 is a prime.

It is a Sophie Germain prime.

Together with 72431941, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72431929) 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 as a sum of consecutive naturals, namely, 36215969 + 36215970.

It is an arithmetic number, because the mean of its divisors is an integer number (36215970).

Almost surely, 2^72431939 is an apocalyptic number.

72431939 is a deficient number, since it is larger than the sum of its proper divisors (1).

72431939 is an equidigital number, since it uses as much as digits as its factorization.

72431939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 38.

The square root of 72431939 is about 8510.6955649935. The cubic root of 72431939 is about 416.8470225787.

The spelling of 72431939 in words is "seventy-two million, four hundred thirty-one thousand, nine hundred thirty-nine".