139829621 has 2 divisors, whose sum is σ = 139829622. Its totient is φ = 139829620.

The previous prime is 139829617. The next prime is 139829681. The reversal of 139829621 is 126928931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132480100 + 7349521 = 11510^2 + 2711^2 .

It is a cyclic number.

It is not a de Polignac number, because 139829621 - 2² = 139829617 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139829681) 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 as a sum of consecutive naturals, namely, 69914810 + 69914811.

It is an arithmetic number, because the mean of its divisors is an integer number (69914811).

Almost surely, 2^139829621 is an apocalyptic number.

It is an amenable number.

139829621 is a deficient number, since it is larger than the sum of its proper divisors (1).

139829621 is an equidigital number, since it uses as much as digits as its factorization.

139829621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 41.

The square root of 139829621 is about 11824.9575474925. The cubic root of 139829621 is about 519.0386837367.

The spelling of 139829621 in words is "one hundred thirty-nine million, eight hundred twenty-nine thousand, six hundred twenty-one".