139632681 has 8 divisors (see below), whose sum is σ = 186740704. Its totient is φ = 92806560.

The previous prime is 139632673. The next prime is 139632683. The reversal of 139632681 is 186236931.

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

It is not a de Polignac number, because 139632681 - 2³ = 139632673 is a prime.

It is a super-2 number, since 2×139632681² = 38994571206495522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139632683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69316 + ... + 71301.

It is an arithmetic number, because the mean of its divisors is an integer number (23342588).

Almost surely, 2^139632681 is an apocalyptic number.

It is an amenable number.

139632681 is a deficient number, since it is larger than the sum of its proper divisors (47108023).

139632681 is a wasteful number, since it uses less digits than its factorization.

139632681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140951.

The product of its digits is 46656, while the sum is 39.

The square root of 139632681 is about 11816.6273107008. The cubic root of 139632681 is about 518.7948929842.

The spelling of 139632681 in words is "one hundred thirty-nine million, six hundred thirty-two thousand, six hundred eighty-one".