139139966 has 32 divisors (see below), whose sum is σ = 247093248. Its totient is φ = 57503520.

The previous prime is 139139953. The next prime is 139139969. The reversal of 139139966 is 669931931.

It is a self number, because there is not a number n which added to its sum of digits gives 139139966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139139969) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 226676 + ... + 227288.

It is an arithmetic number, because the mean of its divisors is an integer number (7721664).

Almost surely, 2^139139966 is an apocalyptic number.

139139966 is a deficient number, since it is larger than the sum of its proper divisors (107953282).

139139966 is a wasteful number, since it uses less digits than its factorization.

139139966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1176.

The product of its digits is 236196, while the sum is 47.

The square root of 139139966 is about 11795.7605096068. The cubic root of 139139966 is about 518.1839584548.

The spelling of 139139966 in words is "one hundred thirty-nine million, one hundred thirty-nine thousand, nine hundred sixty-six".