404387 has 2 divisors, whose sum is σ = 404388. Its totient is φ = 404386.

The previous prime is 404381. The next prime is 404389. The reversal of 404387 is 783404.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 404387 - 2⁶ = 404323 is a prime.

Together with 404389, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (404381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202193 + 202194.

It is an arithmetic number, because the mean of its divisors is an integer number (202194).

2⁴⁰⁴³⁸⁷ is an apocalyptic number.

404387 is a deficient number, since it is larger than the sum of its proper divisors (1).

404387 is an equidigital number, since it uses as much as digits as its factorization.

404387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 404387 is about 635.9143024025. The cubic root of 404387 is about 73.9490152822.

The spelling of 404387 in words is "four hundred four thousand, three hundred eighty-seven".