139910721 has 8 divisors (see below), whose sum is σ = 187112544. Its totient is φ = 92991360.

The previous prime is 139910689. The next prime is 139910753. The reversal of 139910721 is 127019931.

It is an interprime number because it is at equal distance from previous prime (139910689) and next prime (139910753).

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

It is not a de Polignac number, because 139910721 - 2⁵ = 139910689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139910791) 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 7 ways as a sum of consecutive naturals, for example, 69456 + ... + 71441.

It is an arithmetic number, because the mean of its divisors is an integer number (23389068).

Almost surely, 2^139910721 is an apocalyptic number.

It is an amenable number.

139910721 is a deficient number, since it is larger than the sum of its proper divisors (47201823).

139910721 is a wasteful number, since it uses less digits than its factorization.

139910721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141231.

The product of its (nonzero) digits is 3402, while the sum is 33.

The square root of 139910721 is about 11828.3862381983. The cubic root of 139910721 is about 519.1390103616.

The spelling of 139910721 in words is "one hundred thirty-nine million, nine hundred ten thousand, seven hundred twenty-one".