72851939 has 2 divisors, whose sum is σ = 72851940. Its totient is φ = 72851938.

The previous prime is 72851917. The next prime is 72851941. The reversal of 72851939 is 93915827.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72851939 - 2¹⁶ = 72786403 is a prime.

It is a Sophie Germain prime.

Together with 72851941, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72851939.

It is not a weakly prime, because it can be changed into another prime (72851969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36425969 + 36425970.

It is an arithmetic number, because the mean of its divisors is an integer number (36425970).

Almost surely, 2^72851939 is an apocalyptic number.

72851939 is a deficient number, since it is larger than the sum of its proper divisors (1).

72851939 is an equidigital number, since it uses as much as digits as its factorization.

72851939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 44.

The square root of 72851939 is about 8535.3347327448. The cubic root of 72851939 is about 417.6511726209.

The spelling of 72851939 in words is "seventy-two million, eight hundred fifty-one thousand, nine hundred thirty-nine".