400213139 has 2 divisors, whose sum is σ = 400213140. Its totient is φ = 400213138.

The previous prime is 400213129. The next prime is 400213147. The reversal of 400213139 is 931312004.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400213139 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (400213129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200106569 + 200106570.

It is an arithmetic number, because the mean of its divisors is an integer number (200106570).

Almost surely, 2^400213139 is an apocalyptic number.

400213139 is a deficient number, since it is larger than the sum of its proper divisors (1).

400213139 is an equidigital number, since it uses as much as digits as its factorization.

400213139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 400213139 is about 20005.3277653729. The cubic root of 400213139 is about 736.9371449556.

The spelling of 400213139 in words is "four hundred million, two hundred thirteen thousand, one hundred thirty-nine".