139564779 has 8 divisors (see below), whose sum is σ = 190625232. Its totient is φ = 90773760.

The previous prime is 139564769. The next prime is 139564801. The reversal of 139564779 is 977465931.

139564779 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 139564779 - 2⁷ = 139564651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139564769) 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, 567214 + ... + 567459.

It is an arithmetic number, because the mean of its divisors is an integer number (23828154).

Almost surely, 2^139564779 is an apocalyptic number.

139564779 is a deficient number, since it is larger than the sum of its proper divisors (51060453).

139564779 is a wasteful number, since it uses less digits than its factorization.

139564779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1134717.

The product of its digits is 1428840, while the sum is 51.

The square root of 139564779 is about 11813.7538064749. The cubic root of 139564779 is about 518.7107843970.

The spelling of 139564779 in words is "one hundred thirty-nine million, five hundred sixty-four thousand, seven hundred seventy-nine".