139640769 has 12 divisors (see below), whose sum is σ = 202550400. Its totient is φ = 92702904.

The previous prime is 139640759. The next prime is 139640779. The reversal of 139640769 is 967046931.

139640769 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (139640759) and next prime (139640779).

It is not a de Polignac number, because 139640769 - 2⁸ = 139640513 is a prime.

It is a super-2 number, since 2×139640769² = 38999088733822722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (139640729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30309 + ... + 34610.

It is an arithmetic number, because the mean of its divisors is an integer number (16879200).

Almost surely, 2^139640769 is an apocalyptic number.

It is an amenable number.

139640769 is a deficient number, since it is larger than the sum of its proper divisors (62909631).

139640769 is a wasteful number, since it uses less digits than its factorization.

139640769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65164 (or 65161 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 139640769 is about 11816.9695353758. The cubic root of 139640769 is about 518.8049095793.

The spelling of 139640769 in words is "one hundred thirty-nine million, six hundred forty thousand, seven hundred sixty-nine".