72399869 has 2 divisors, whose sum is σ = 72399870. Its totient is φ = 72399868.

The previous prime is 72399841. The next prime is 72399893. The reversal of 72399869 is 96899327.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61042969 + 11356900 = 7813^2 + 3370^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72399869 is a prime.

It is a super-2 number, since 2×72399869² = 10483482062434322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 72399869.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72399829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36199934 + 36199935.

It is an arithmetic number, because the mean of its divisors is an integer number (36199935).

Almost surely, 2^72399869 is an apocalyptic number.

It is an amenable number.

72399869 is a deficient number, since it is larger than the sum of its proper divisors (1).

72399869 is an equidigital number, since it uses as much as digits as its factorization.

72399869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1469664, while the sum is 53.

The square root of 72399869 is about 8508.8112565740. The cubic root of 72399869 is about 416.7854923676.

The spelling of 72399869 in words is "seventy-two million, three hundred ninety-nine thousand, eight hundred sixty-nine".