72193397 has 2 divisors, whose sum is σ = 72193398. Its totient is φ = 72193396.

The previous prime is 72193393. The next prime is 72193399. The reversal of 72193397 is 79339127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37075921 + 35117476 = 6089^2 + 5926^2 .

It is a cyclic number.

It is not a de Polignac number, because 72193397 - 2² = 72193393 is a prime.

Together with 72193399, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72193393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36096698 + 36096699.

It is an arithmetic number, because the mean of its divisors is an integer number (36096699).

Almost surely, 2^72193397 is an apocalyptic number.

It is an amenable number.

72193397 is a deficient number, since it is larger than the sum of its proper divisors (1).

72193397 is an equidigital number, since it uses as much as digits as its factorization.

72193397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 71442, while the sum is 41.

The square root of 72193397 is about 8496.6697593822. The cubic root of 72193397 is about 416.3889149084.

The spelling of 72193397 in words is "seventy-two million, one hundred ninety-three thousand, three hundred ninety-seven".