139430621 has 8 divisors (see below), whose sum is σ = 153939744. Its totient is φ = 125227120.

The previous prime is 139430609. The next prime is 139430647. The reversal of 139430621 is 126034931.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139430621 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 (139430021) 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, 75446 + ... + 77271.

It is an arithmetic number, because the mean of its divisors is an integer number (19242468).

Almost surely, 2^139430621 is an apocalyptic number.

139430621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

139430621 is a deficient number, since it is larger than the sum of its proper divisors (14509123).

139430621 is a wasteful number, since it uses less digits than its factorization.

139430621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152811.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 139430621 is about 11808.0743984784. The cubic root of 139430621 is about 518.5445258524.

The spelling of 139430621 in words is "one hundred thirty-nine million, four hundred thirty thousand, six hundred twenty-one".