104399639 has 2 divisors, whose sum is σ = 104399640. Its totient is φ = 104399638.

The previous prime is 104399621. The next prime is 104399677. The reversal of 104399639 is 936993401.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 104399639 - 2¹⁶ = 104334103 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 104399639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (104390639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52199819 + 52199820.

It is an arithmetic number, because the mean of its divisors is an integer number (52199820).

Almost surely, 2^104399639 is an apocalyptic number.

104399639 is a deficient number, since it is larger than the sum of its proper divisors (1).

104399639 is an equidigital number, since it uses as much as digits as its factorization.

104399639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 157464, while the sum is 44.

The square root of 104399639 is about 10217.6141539990. The cubic root of 104399639 is about 470.8685298320.

The spelling of 104399639 in words is "one hundred four million, three hundred ninety-nine thousand, six hundred thirty-nine".