139131746 has 16 divisors (see below), whose sum is σ = 229979904. Its totient is φ = 62720784.

The previous prime is 139131743. The next prime is 139131749. The reversal of 139131746 is 647131931.

It is a happy number.

139131746 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 (139131743) and next prime (139131749).

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (139131743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61106 + ... + 63341.

It is an arithmetic number, because the mean of its divisors is an integer number (14373744).

Almost surely, 2^139131746 is an apocalyptic number.

139131746 is a deficient number, since it is larger than the sum of its proper divisors (90848158).

139131746 is a wasteful number, since it uses less digits than its factorization.

139131746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124505.

The product of its digits is 13608, while the sum is 35.

The square root of 139131746 is about 11795.4120741922. The cubic root of 139131746 is about 518.1737539676.

The spelling of 139131746 in words is "one hundred thirty-nine million, one hundred thirty-one thousand, seven hundred forty-six".