400236013391 has 2 divisors, whose sum is σ = 400236013392. Its totient is φ = 400236013390.

The previous prime is 400236013349. The next prime is 400236013427. The reversal of 400236013391 is 193310632004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400236013391 - 2²² = 400231819087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400236013591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200118006695 + 200118006696.

It is an arithmetic number, because the mean of its divisors is an integer number (200118006696).

Almost surely, 2^400236013391 is an apocalyptic number.

400236013391 is a deficient number, since it is larger than the sum of its proper divisors (1).

400236013391 is an equidigital number, since it uses as much as digits as its factorization.

400236013391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 32.

Adding to 400236013391 its reverse (193310632004), we get a palindrome (593546645395).

The spelling of 400236013391 in words is "four hundred billion, two hundred thirty-six million, thirteen thousand, three hundred ninety-one".