139029681 has 8 divisors (see below), whose sum is σ = 211854784. Its totient is φ = 79445520.

The previous prime is 139029677. The next prime is 139029719. The reversal of 139029681 is 186920931.

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

It is not a de Polignac number, because 139029681 - 2² = 139029677 is a prime.

It is a super-2 number, since 2×139029681² = 38658504397923522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139029581) 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, 3310210 + ... + 3310251.

It is an arithmetic number, because the mean of its divisors is an integer number (26481848).

Almost surely, 2^139029681 is an apocalyptic number.

It is an amenable number.

139029681 is a deficient number, since it is larger than the sum of its proper divisors (72825103).

139029681 is an equidigital number, since it uses as much as digits as its factorization.

139029681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6620471.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 139029681 is about 11791.0848101436. The cubic root of 139029681 is about 518.0470147595.

The spelling of 139029681 in words is "one hundred thirty-nine million, twenty-nine thousand, six hundred eighty-one".