139969905 has 16 divisors (see below), whose sum is σ = 224204544. Its totient is φ = 74566400.

The previous prime is 139969877. The next prime is 139969931. The reversal of 139969905 is 509969931.

139969905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 139969905 - 2⁸ = 139969649 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9880 + ... + 19430.

It is an arithmetic number, because the mean of its divisors is an integer number (14012784).

Almost surely, 2^139969905 is an apocalyptic number.

139969905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

139969905 is a deficient number, since it is larger than the sum of its proper divisors (84234639).

139969905 is an equidigital number, since it uses as much as digits as its factorization.

139969905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10536.

The product of its (nonzero) digits is 590490, while the sum is 51.

The square root of 139969905 is about 11830.8877519821. The cubic root of 139969905 is about 519.2122008259.

The spelling of 139969905 in words is "one hundred thirty-nine million, nine hundred sixty-nine thousand, nine hundred five".