213402239 has 2 divisors, whose sum is σ = 213402240. Its totient is φ = 213402238.

The previous prime is 213402187. The next prime is 213402251. The reversal of 213402239 is 932204312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213402239 is a prime.

It is a super-2 number, since 2×213402239² = 91081031220426242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213402289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106701119 + 106701120.

It is an arithmetic number, because the mean of its divisors is an integer number (106701120).

Almost surely, 2^213402239 is an apocalyptic number.

213402239 is a deficient number, since it is larger than the sum of its proper divisors (1).

213402239 is an equidigital number, since it uses as much as digits as its factorization.

213402239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 213402239 is about 14608.2935006112. The cubic root of 213402239 is about 597.5849580704.

The spelling of 213402239 in words is "two hundred thirteen million, four hundred two thousand, two hundred thirty-nine".