72502139 has 2 divisors, whose sum is σ = 72502140. Its totient is φ = 72502138.

The previous prime is 72502109. The next prime is 72502151. The reversal of 72502139 is 93120527.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72502139 - 2⁸ = 72501883 is a prime.

It is a super-3 number, since 3×72502139³ (a number of 25 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (72502109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36251069 + 36251070.

It is an arithmetic number, because the mean of its divisors is an integer number (36251070).

Almost surely, 2^72502139 is an apocalyptic number.

72502139 is a deficient number, since it is larger than the sum of its proper divisors (1).

72502139 is an equidigital number, since it uses as much as digits as its factorization.

72502139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 72502139 is about 8514.8187884417. The cubic root of 72502139 is about 416.9816464883.

The spelling of 72502139 in words is "seventy-two million, five hundred two thousand, one hundred thirty-nine".