139662681 has 8 divisors (see below), whose sum is σ = 187925760. Its totient is φ = 92254032.

The previous prime is 139662643. The next prime is 139662683. The reversal of 139662681 is 186266931.

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

It is not a de Polignac number, because 139662681 - 2⁹ = 139662169 is a prime.

It is a super-2 number, since 2×139662681² = 39011328928215522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (139662683) 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, 213225 + ... + 213878.

It is an arithmetic number, because the mean of its divisors is an integer number (23490720).

Almost surely, 2^139662681 is an apocalyptic number.

It is an amenable number.

139662681 is a deficient number, since it is larger than the sum of its proper divisors (48263079).

139662681 is a wasteful number, since it uses less digits than its factorization.

139662681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427215.

The product of its digits is 93312, while the sum is 42.

The square root of 139662681 is about 11817.8966402656. The cubic root of 139662681 is about 518.8320445837.

The spelling of 139662681 in words is "one hundred thirty-nine million, six hundred sixty-two thousand, six hundred eighty-one".