213490939 has 2 divisors, whose sum is σ = 213490940. Its totient is φ = 213490938.

The previous prime is 213490919. The next prime is 213490957. The reversal of 213490939 is 939094312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213490939 - 2⁹ = 213490427 is a prime.

It is not a weakly prime, because it can be changed into another prime (213490919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106745469 + 106745470.

It is an arithmetic number, because the mean of its divisors is an integer number (106745470).

Almost surely, 2^213490939 is an apocalyptic number.

213490939 is a deficient number, since it is larger than the sum of its proper divisors (1).

213490939 is an equidigital number, since it uses as much as digits as its factorization.

213490939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 40.

The square root of 213490939 is about 14611.3291318757. The cubic root of 213490939 is about 597.6677413998.

The spelling of 213490939 in words is "two hundred thirteen million, four hundred ninety thousand, nine hundred thirty-nine".