400239013 has 2 divisors, whose sum is σ = 400239014. Its totient is φ = 400239012.

The previous prime is 400239011. The next prime is 400239017. The reversal of 400239013 is 310932004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 268402689 + 131836324 = 16383^2 + 11482^2 .

It is a cyclic number.

It is not a de Polignac number, because 400239013 - 2¹ = 400239011 is a prime.

Together with 400239011, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400239011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200119506 + 200119507.

It is an arithmetic number, because the mean of its divisors is an integer number (200119507).

Almost surely, 2^400239013 is an apocalyptic number.

It is an amenable number.

400239013 is a deficient number, since it is larger than the sum of its proper divisors (1).

400239013 is an equidigital number, since it uses as much as digits as its factorization.

400239013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 400239013 is about 20005.9744326539. The cubic root of 400239013 is about 736.9530257442.

The spelling of 400239013 in words is "four hundred million, two hundred thirty-nine thousand, thirteen".