139009905 has 32 divisors (see below), whose sum is σ = 255657600. Its totient is φ = 71580096.

The previous prime is 139009877. The next prime is 139009919. The reversal of 139009905 is 509900931.

It is not a de Polignac number, because 139009905 - 2⁸ = 139009649 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139009905.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13839 + ... + 21668.

It is an arithmetic number, because the mean of its divisors is an integer number (7989300).

Almost surely, 2^139009905 is an apocalyptic number.

139009905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

139009905 is a deficient number, since it is larger than the sum of its proper divisors (116647695).

139009905 is a wasteful number, since it uses less digits than its factorization.

139009905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35550 (or 35544 counting only the distinct ones).

The product of its (nonzero) digits is 10935, while the sum is 36.

The square root of 139009905 is about 11790.2461806359. The cubic root of 139009905 is about 518.0224507396.

The spelling of 139009905 in words is "one hundred thirty-nine million, nine thousand, nine hundred five".