204402139 has 2 divisors, whose sum is σ = 204402140. Its totient is φ = 204402138.

The previous prime is 204402119. The next prime is 204402157. The reversal of 204402139 is 931204402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 204402139 - 2¹³ = 204393947 is a prime.

It is not a weakly prime, because it can be changed into another prime (204402109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102201069 + 102201070.

It is an arithmetic number, because the mean of its divisors is an integer number (102201070).

Almost surely, 2^204402139 is an apocalyptic number.

204402139 is a deficient number, since it is larger than the sum of its proper divisors (1).

204402139 is an equidigital number, since it uses as much as digits as its factorization.

204402139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 204402139 is about 14296.9276070070. The cubic root of 204402139 is about 589.0630911804.

The spelling of 204402139 in words is "two hundred four million, four hundred two thousand, one hundred thirty-nine".