72052139 has 2 divisors, whose sum is σ = 72052140. Its totient is φ = 72052138.

The previous prime is 72052117. The next prime is 72052147. The reversal of 72052139 is 93125027.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72052139 - 2¹² = 72048043 is a prime.

It is not a weakly prime, because it can be changed into another prime (72052109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36026069 + 36026070.

It is an arithmetic number, because the mean of its divisors is an integer number (36026070).

Almost surely, 2^72052139 is an apocalyptic number.

72052139 is a deficient number, since it is larger than the sum of its proper divisors (1).

72052139 is an equidigital number, since it uses as much as digits as its factorization.

72052139 is an odious number, because the sum of its binary digits is odd.

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

The square root of 72052139 is about 8488.3531382713. The cubic root of 72052139 is about 416.1171602789.

The spelling of 72052139 in words is "seventy-two million, fifty-two thousand, one hundred thirty-nine".