213842939 has 2 divisors, whose sum is σ = 213842940. Its totient is φ = 213842938.

The previous prime is 213842899. The next prime is 213842953. The reversal of 213842939 is 939248312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213842939 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 213842896 and 213842905.

It is not a weakly prime, because it can be changed into another prime (213842989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106921469 + 106921470.

It is an arithmetic number, because the mean of its divisors is an integer number (106921470).

Almost surely, 2^213842939 is an apocalyptic number.

213842939 is a deficient number, since it is larger than the sum of its proper divisors (1).

213842939 is an equidigital number, since it uses as much as digits as its factorization.

213842939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 41.

The square root of 213842939 is about 14623.3696185250. The cubic root of 213842939 is about 597.9960356258.

The spelling of 213842939 in words is "two hundred thirteen million, eight hundred forty-two thousand, nine hundred thirty-nine".