140123979 has 16 divisors (see below), whose sum is σ = 219803040. Its totient is φ = 87920640.

The previous prime is 140123957. The next prime is 140123987. The reversal of 140123979 is 979321041.

140123979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 140123979 - 2⁸ = 140123723 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (140123909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152182 + ... + 153099.

It is an arithmetic number, because the mean of its divisors is an integer number (13737690).

Almost surely, 2^140123979 is an apocalyptic number.

140123979 is a deficient number, since it is larger than the sum of its proper divisors (79679061).

140123979 is a wasteful number, since it uses less digits than its factorization.

140123979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305307 (or 305301 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 140123979 is about 11837.3974757968. The cubic root of 140123979 is about 519.4026412064.

The spelling of 140123979 in words is "one hundred forty million, one hundred twenty-three thousand, nine hundred seventy-nine".