139972939 has 2 divisors, whose sum is σ = 139972940. Its totient is φ = 139972938.

The previous prime is 139972933. The next prime is 139972991. The reversal of 139972939 is 939279931.

139972939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (139972991) can be obtained adding 139972939 to its sum of digits (52).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139972939 - 2²³ = 131584331 is a prime.

It is not a weakly prime, because it can be changed into another prime (139972933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69986469 + 69986470.

It is an arithmetic number, because the mean of its divisors is an integer number (69986470).

Almost surely, 2^139972939 is an apocalyptic number.

139972939 is a deficient number, since it is larger than the sum of its proper divisors (1).

139972939 is an equidigital number, since it uses as much as digits as its factorization.

139972939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 826686, while the sum is 52.

The square root of 139972939 is about 11831.0159749702. The cubic root of 139972939 is about 519.2159522953.

The spelling of 139972939 in words is "one hundred thirty-nine million, nine hundred seventy-two thousand, nine hundred thirty-nine".