72370391 has 2 divisors, whose sum is σ = 72370392. Its totient is φ = 72370390.

The previous prime is 72370381. The next prime is 72370421. The reversal of 72370391 is 19307327.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72370391 - 2⁶ = 72370327 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72370301) 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, 36185195 + 36185196.

It is an arithmetic number, because the mean of its divisors is an integer number (36185196).

Almost surely, 2^72370391 is an apocalyptic number.

72370391 is a deficient number, since it is larger than the sum of its proper divisors (1).

72370391 is an equidigital number, since it uses as much as digits as its factorization.

72370391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7938, while the sum is 32.

The square root of 72370391 is about 8507.0788758539. The cubic root of 72370391 is about 416.7289191964.

The spelling of 72370391 in words is "seventy-two million, three hundred seventy thousand, three hundred ninety-one".