139247279 has 2 divisors, whose sum is σ = 139247280. Its totient is φ = 139247278.

The previous prime is 139247249. The next prime is 139247309. The reversal of 139247279 is 972742931.

It is a balanced prime because it is at equal distance from previous prime (139247249) and next prime (139247309).

It is a cyclic number.

It is not a de Polignac number, because 139247279 - 2²⁰ = 138198703 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139247209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69623639 + 69623640.

It is an arithmetic number, because the mean of its divisors is an integer number (69623640).

Almost surely, 2^139247279 is an apocalyptic number.

139247279 is a deficient number, since it is larger than the sum of its proper divisors (1).

139247279 is an equidigital number, since it uses as much as digits as its factorization.

139247279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 44.

The square root of 139247279 is about 11800.3084281725. The cubic root of 139247279 is about 518.3171422956.

The spelling of 139247279 in words is "one hundred thirty-nine million, two hundred forty-seven thousand, two hundred seventy-nine".