404052391 has 2 divisors, whose sum is σ = 404052392. Its totient is φ = 404052390.

The previous prime is 404052377. The next prime is 404052403. The reversal of 404052391 is 193250404.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 404052391 - 2⁵ = 404052359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404052301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202026195 + 202026196.

It is an arithmetic number, because the mean of its divisors is an integer number (202026196).

Almost surely, 2^404052391 is an apocalyptic number.

404052391 is a deficient number, since it is larger than the sum of its proper divisors (1).

404052391 is an equidigital number, since it uses as much as digits as its factorization.

404052391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 404052391 is about 20101.0544748279. The cubic root of 404052391 is about 739.2861334549.

The spelling of 404052391 in words is "four hundred four million, fifty-two thousand, three hundred ninety-one".