139309479 has 12 divisors (see below), whose sum is σ = 202280832. Its totient is φ = 92385600.

The previous prime is 139309439. The next prime is 139309481. The reversal of 139309479 is 974903931.

139309479 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-139309479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139309439) 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, 38802 + ... + 42239.

It is an arithmetic number, because the mean of its divisors is an integer number (16856736).

Almost surely, 2^139309479 is an apocalyptic number.

139309479 is a deficient number, since it is larger than the sum of its proper divisors (62971353).

139309479 is a wasteful number, since it uses less digits than its factorization.

139309479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81238 (or 81235 counting only the distinct ones).

The product of its (nonzero) digits is 183708, while the sum is 45.

The square root of 139309479 is about 11802.9436582575. The cubic root of 139309479 is about 518.3943060467.

It can be divided in two parts, 13930 and 9479, that added together give a square (23409 = 153²).

The spelling of 139309479 in words is "one hundred thirty-nine million, three hundred nine thousand, four hundred seventy-nine".