139645905 has 32 divisors (see below), whose sum is σ = 270376704. Its totient is φ = 60082176.

The previous prime is 139645867. The next prime is 139645931. The reversal of 139645905 is 509546931.

It is not a de Polignac number, because 139645905 - 2⁶ = 139645841 is a prime.

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, 37332 + ... + 40901.

It is an arithmetic number, because the mean of its divisors is an integer number (8449272).

Almost surely, 2^139645905 is an apocalyptic number.

139645905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

139645905 is a deficient number, since it is larger than the sum of its proper divisors (130730799).

139645905 is a wasteful number, since it uses less digits than its factorization.

139645905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78265.

The product of its (nonzero) digits is 145800, while the sum is 42.

The square root of 139645905 is about 11817.1868479770. The cubic root of 139645905 is about 518.8112700650.

The spelling of 139645905 in words is "one hundred thirty-nine million, six hundred forty-five thousand, nine hundred five".