72400357 has 2 divisors, whose sum is σ = 72400358. Its totient is φ = 72400356.

The previous prime is 72400259. The next prime is 72400369. The reversal of 72400357 is 75300427.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50253921 + 22146436 = 7089^2 + 4706^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72400357 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 (72400387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36200178 + 36200179.

It is an arithmetic number, because the mean of its divisors is an integer number (36200179).

Almost surely, 2^72400357 is an apocalyptic number.

It is an amenable number.

72400357 is a deficient number, since it is larger than the sum of its proper divisors (1).

72400357 is an equidigital number, since it uses as much as digits as its factorization.

72400357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5880, while the sum is 28.

The square root of 72400357 is about 8508.8399326818. The cubic root of 72400357 is about 416.7864287914.

The spelling of 72400357 in words is "seventy-two million, four hundred thousand, three hundred fifty-seven".