404879381 has 2 divisors, whose sum is σ = 404879382. Its totient is φ = 404879380.

The previous prime is 404879323. The next prime is 404879441. The reversal of 404879381 is 183978404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 402644356 + 2235025 = 20066^2 + 1495^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-404879381 is a prime.

It is a super-2 number, since 2×404879381² = 327854626317886322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404879311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202439690 + 202439691.

It is an arithmetic number, because the mean of its divisors is an integer number (202439691).

Almost surely, 2^404879381 is an apocalyptic number.

It is an amenable number.

404879381 is a deficient number, since it is larger than the sum of its proper divisors (1).

404879381 is an equidigital number, since it uses as much as digits as its factorization.

404879381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 404879381 is about 20121.6147711857. The cubic root of 404879381 is about 739.7901651212.

The spelling of 404879381 in words is "four hundred four million, eight hundred seventy-nine thousand, three hundred eighty-one".