139809901 has 16 divisors (see below), whose sum is σ = 174895488. Its totient is φ = 108576000.

The previous prime is 139809871. The next prime is 139809911. The reversal of 139809901 is 109908931.

It is a cyclic number.

It is not a de Polignac number, because 139809901 - 2⁵ = 139809869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139809911) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 21201 + ... + 27001.

It is an arithmetic number, because the mean of its divisors is an integer number (10930968).

Almost surely, 2^139809901 is an apocalyptic number.

139809901 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

139809901 is a deficient number, since it is larger than the sum of its proper divisors (35085587).

139809901 is a wasteful number, since it uses less digits than its factorization.

139809901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6132.

The product of its (nonzero) digits is 17496, while the sum is 40.

The square root of 139809901 is about 11824.1236884600. The cubic root of 139809901 is about 519.0142827932.

The spelling of 139809901 in words is "one hundred thirty-nine million, eight hundred nine thousand, nine hundred one".