72397811 has 2 divisors, whose sum is σ = 72397812. Its totient is φ = 72397810.

The previous prime is 72397807. The next prime is 72397861. The reversal of 72397811 is 11879327.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72397811 - 2² = 72397807 is a prime.

It is not a weakly prime, because it can be changed into another prime (72397861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36198905 + 36198906.

It is an arithmetic number, because the mean of its divisors is an integer number (36198906).

Almost surely, 2^72397811 is an apocalyptic number.

72397811 is a deficient number, since it is larger than the sum of its proper divisors (1).

72397811 is an equidigital number, since it uses as much as digits as its factorization.

72397811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 38.

The square root of 72397811 is about 8508.6903222529. The cubic root of 72397811 is about 416.7815432230.

The spelling of 72397811 in words is "seventy-two million, three hundred ninety-seven thousand, eight hundred eleven".