139130402 has 4 divisors (see below), whose sum is σ = 208695606. Its totient is φ = 69565200.

The previous prime is 139130401. The next prime is 139130423. The reversal of 139130402 is 204031931.

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

It can be written as a sum of positive squares in only one way, i.e., 124300201 + 14830201 = 11149^2 + 3851^2 .

It is not an unprimeable number, because it can be changed into a prime (139130401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34782599 + ... + 34782602.

Almost surely, 2^139130402 is an apocalyptic number.

139130402 is a deficient number, since it is larger than the sum of its proper divisors (69565204).

139130402 is an equidigital number, since it uses as much as digits as its factorization.

139130402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69565203.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 139130402 is about 11795.3551027513. The cubic root of 139130402 is about 518.1720854585.

The spelling of 139130402 in words is "one hundred thirty-nine million, one hundred thirty thousand, four hundred two".