139927621 has 4 divisors (see below), whose sum is σ = 139952044. Its totient is φ = 139903200.

The previous prime is 139927597. The next prime is 139927637. The reversal of 139927621 is 126729931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 126729931 = 23 ⋅5509997.

It can be written as a sum of positive squares in 2 ways, for example, as 101002500 + 38925121 = 10050^2 + 6239^2 .

It is a cyclic number.

It is not a de Polignac number, because 139927621 - 2¹⁹ = 139403333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139927651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1561 + ... + 16801.

It is an arithmetic number, because the mean of its divisors is an integer number (34988011).

Almost surely, 2^139927621 is an apocalyptic number.

It is an amenable number.

139927621 is a deficient number, since it is larger than the sum of its proper divisors (24423).

139927621 is an equidigital number, since it uses as much as digits as its factorization.

139927621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24422.

The product of its digits is 40824, while the sum is 40.

The square root of 139927621 is about 11829.1005997920. The cubic root of 139927621 is about 519.1599120147.

The spelling of 139927621 in words is "one hundred thirty-nine million, nine hundred twenty-seven thousand, six hundred twenty-one".