139620605 has 4 divisors (see below), whose sum is σ = 167544732. Its totient is φ = 111696480.

The previous prime is 139620601. The next prime is 139620617. The reversal of 139620605 is 506026931.

It is a happy number.

139620605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 73994404 + 65626201 = 8602^2 + 8101^2 .

It is not a de Polignac number, because 139620605 - 2² = 139620601 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139620601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13962056 + ... + 13962065.

It is an arithmetic number, because the mean of its divisors is an integer number (41886183).

Almost surely, 2^139620605 is an apocalyptic number.

It is an amenable number.

139620605 is a deficient number, since it is larger than the sum of its proper divisors (27924127).

139620605 is an equidigital number, since it uses as much as digits as its factorization.

139620605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27924126.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 139620605 is about 11816.1163247490. The cubic root of 139620605 is about 518.7799367249.

The spelling of 139620605 in words is "one hundred thirty-nine million, six hundred twenty thousand, six hundred five".