72210139 has 2 divisors, whose sum is σ = 72210140. Its totient is φ = 72210138.

The previous prime is 72210137. The next prime is 72210181. The reversal of 72210139 is 93101227.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72210139 - 2¹ = 72210137 is a prime.

Together with 72210137, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (72210137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36105069 + 36105070.

It is an arithmetic number, because the mean of its divisors is an integer number (36105070).

Almost surely, 2^72210139 is an apocalyptic number.

72210139 is a deficient number, since it is larger than the sum of its proper divisors (1).

72210139 is an equidigital number, since it uses as much as digits as its factorization.

72210139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 72210139 is about 8497.6549117977. The cubic root of 72210139 is about 416.4210999590.

The spelling of 72210139 in words is "seventy-two million, two hundred ten thousand, one hundred thirty-nine".