72400247 has 2 divisors, whose sum is σ = 72400248. Its totient is φ = 72400246.

The previous prime is 72400243. The next prime is 72400259. The reversal of 72400247 is 74200427.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72400247 - 2² = 72400243 is a prime.

It is a super-2 number, since 2×72400247² = 10483591531322018, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72400243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36200123 + 36200124.

It is an arithmetic number, because the mean of its divisors is an integer number (36200124).

Almost surely, 2^72400247 is an apocalyptic number.

72400247 is a deficient number, since it is larger than the sum of its proper divisors (1).

72400247 is an equidigital number, since it uses as much as digits as its factorization.

72400247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3136, while the sum is 26.

The square root of 72400247 is about 8508.8334688135. The cubic root of 72400247 is about 416.7862177126.

The spelling of 72400247 in words is "seventy-two million, four hundred thousand, two hundred forty-seven".