139707021 has 8 divisors (see below), whose sum is σ = 186331264. Its totient is φ = 93110400.

The previous prime is 139706971. The next prime is 139707031. The reversal of 139707021 is 120707931.

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

It is not a de Polignac number, because 139707021 - 2¹⁰ = 139705997 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 139707021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139707031) 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, 13596 + ... + 21546.

It is an arithmetic number, because the mean of its divisors is an integer number (23291408).

Almost surely, 2^139707021 is an apocalyptic number.

It is an amenable number.

139707021 is a deficient number, since it is larger than the sum of its proper divisors (46624243).

139707021 is an equidigital number, since it uses as much as digits as its factorization.

139707021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13811.

The product of its (nonzero) digits is 2646, while the sum is 30.

The square root of 139707021 is about 11819.7724597388. The cubic root of 139707021 is about 518.8869449063.

The spelling of 139707021 in words is "one hundred thirty-nine million, seven hundred seven thousand, twenty-one".