139809601 has 8 divisors (see below), whose sum is σ = 143576064. Its totient is φ = 136085040.

The previous prime is 139809587. The next prime is 139809653. The reversal of 139809601 is 106908931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139809601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139809661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3655 + ... + 17116.

It is an arithmetic number, because the mean of its divisors is an integer number (17947008).

Almost surely, 2^139809601 is an apocalyptic number.

It is an amenable number.

139809601 is a deficient number, since it is larger than the sum of its proper divisors (3766463).

139809601 is a wasteful number, since it uses less digits than its factorization.

139809601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20951.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 139809601 is about 11824.1110025236. Note that the first 3 decimals coincide. The cubic root of 139809601 is about 519.0139115644.

The spelling of 139809601 in words is "one hundred thirty-nine million, eight hundred nine thousand, six hundred one".