404340343991 has 2 divisors, whose sum is σ = 404340343992. Its totient is φ = 404340343990.

The previous prime is 404340343973. The next prime is 404340344039. The reversal of 404340343991 is 199343043404.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-404340343991 is a prime.

It is a super-2 number, since 2×404340343991² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404340343951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202170171995 + 202170171996.

It is an arithmetic number, because the mean of its divisors is an integer number (202170171996).

Almost surely, 2^404340343991 is an apocalyptic number.

404340343991 is a deficient number, since it is larger than the sum of its proper divisors (1).

404340343991 is an equidigital number, since it uses as much as digits as its factorization.

404340343991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 559872, while the sum is 44.

The spelling of 404340343991 in words is "four hundred four billion, three hundred forty million, three hundred forty-three thousand, nine hundred ninety-one".