139139967 has 4 divisors (see below), whose sum is σ = 185519960. Its totient is φ = 92759976.

The previous prime is 139139953. The next prime is 139139969. The reversal of 139139967 is 769931931.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 139139967 - 2⁸ = 139139711 is a prime.

It is a super-2 number, since 2×139139967² = 38719860833522178, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139139969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23189992 + ... + 23189997.

It is an arithmetic number, because the mean of its divisors is an integer number (46379990).

Almost surely, 2^139139967 is an apocalyptic number.

139139967 is a deficient number, since it is larger than the sum of its proper divisors (46379993).

139139967 is an equidigital number, since it uses as much as digits as its factorization.

139139967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46379992.

The product of its digits is 275562, while the sum is 48.

The square root of 139139967 is about 11795.7605519949. The cubic root of 139139967 is about 518.1839596962.

The spelling of 139139967 in words is "one hundred thirty-nine million, one hundred thirty-nine thousand, nine hundred sixty-seven".