204142639 has 2 divisors, whose sum is σ = 204142640. Its totient is φ = 204142638.

The previous prime is 204142633. The next prime is 204142663. The reversal of 204142639 is 936241402.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 204142639 - 2⁵ = 204142607 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 204142639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204142633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102071319 + 102071320.

It is an arithmetic number, because the mean of its divisors is an integer number (102071320).

Almost surely, 2^204142639 is an apocalyptic number.

204142639 is a deficient number, since it is larger than the sum of its proper divisors (1).

204142639 is an equidigital number, since it uses as much as digits as its factorization.

204142639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 204142639 is about 14287.8493483099. The cubic root of 204142639 is about 588.8137027160.

The spelling of 204142639 in words is "two hundred four million, one hundred forty-two thousand, six hundred thirty-nine".