72397739 has 2 divisors, whose sum is σ = 72397740. Its totient is φ = 72397738.

The previous prime is 72397729. The next prime is 72397769. The reversal of 72397739 is 93779327.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72397739 - 2¹⁶ = 72332203 is a prime.

It is a super-2 number, since 2×72397739² = 10482865224624242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72397693 and 72397702.

It is not a weakly prime, because it can be changed into another prime (72397729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36198869 + 36198870.

It is an arithmetic number, because the mean of its divisors is an integer number (36198870).

Almost surely, 2^72397739 is an apocalyptic number.

72397739 is a deficient number, since it is larger than the sum of its proper divisors (1).

72397739 is an equidigital number, since it uses as much as digits as its factorization.

72397739 is an odious number, because the sum of its binary digits is odd.

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

The square root of 72397739 is about 8508.6860912834. The cubic root of 72397739 is about 416.7814050591.

The spelling of 72397739 in words is "seventy-two million, three hundred ninety-seven thousand, seven hundred thirty-nine".