139799566 has 16 divisors (see below), whose sum is σ = 220869504. Its totient is φ = 66233464.

The previous prime is 139799563. The next prime is 139799593. The reversal of 139799566 is 665997931.

139799566 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139799563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9280 + ... + 19123.

It is an arithmetic number, because the mean of its divisors is an integer number (13804344).

Almost surely, 2^139799566 is an apocalyptic number.

139799566 is a deficient number, since it is larger than the sum of its proper divisors (81069938).

139799566 is a wasteful number, since it uses less digits than its factorization.

139799566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28535.

The product of its digits is 2755620, while the sum is 55.

The square root of 139799566 is about 11823.6866501104. The cubic root of 139799566 is about 519.0014936541.

The spelling of 139799566 in words is "one hundred thirty-nine million, seven hundred ninety-nine thousand, five hundred sixty-six".