72399737 has 2 divisors, whose sum is σ = 72399738. Its totient is φ = 72399736.

The previous prime is 72399707. The next prime is 72399763. The reversal of 72399737 is 73799327.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55785961 + 16613776 = 7469^2 + 4076^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72399737 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 72399691 and 72399700.

It is not a weakly prime, because it can be changed into another prime (72399707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36199868 + 36199869.

It is an arithmetic number, because the mean of its divisors is an integer number (36199869).

Almost surely, 2^72399737 is an apocalyptic number.

It is an amenable number.

72399737 is a deficient number, since it is larger than the sum of its proper divisors (1).

72399737 is an equidigital number, since it uses as much as digits as its factorization.

72399737 is an evil number, because the sum of its binary digits is even.

The product of its digits is 500094, while the sum is 47.

The square root of 72399737 is about 8508.8034999053. The cubic root of 72399737 is about 416.7852390720.

The spelling of 72399737 in words is "seventy-two million, three hundred ninety-nine thousand, seven hundred thirty-seven".