139245947 has 2 divisors, whose sum is σ = 139245948. Its totient is φ = 139245946.

The previous prime is 139245943. The next prime is 139245949. The reversal of 139245947 is 749542931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 139245947 - 2² = 139245943 is a prime.

Together with 139245949, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 139245898 and 139245907.

It is not a weakly prime, because it can be changed into another prime (139245943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69622973 + 69622974.

It is an arithmetic number, because the mean of its divisors is an integer number (69622974).

Almost surely, 2^139245947 is an apocalyptic number.

139245947 is the 6308-th centered heptagonal number.

139245947 is a deficient number, since it is larger than the sum of its proper divisors (1).

139245947 is an equidigital number, since it uses as much as digits as its factorization.

139245947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 44.

The square root of 139245947 is about 11800.2519888348. The cubic root of 139245947 is about 518.3154895987.

The spelling of 139245947 in words is "one hundred thirty-nine million, two hundred forty-five thousand, nine hundred forty-seven".