404605381 has 2 divisors, whose sum is σ = 404605382. Its totient is φ = 404605380.

The previous prime is 404605309. The next prime is 404605387. The reversal of 404605381 is 183506404.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 318301281 + 86304100 = 17841^2 + 9290^2 .

It is a cyclic number.

It is not a de Polignac number, because 404605381 - 2⁹ = 404604869 is a prime.

It is a super-2 number, since 2×404605381² = 327411028668310322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404605387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202302690 + 202302691.

It is an arithmetic number, because the mean of its divisors is an integer number (202302691).

Almost surely, 2^404605381 is an apocalyptic number.

It is an amenable number.

404605381 is a deficient number, since it is larger than the sum of its proper divisors (1).

404605381 is an equidigital number, since it uses as much as digits as its factorization.

404605381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 404605381 is about 20114.8050201835. The cubic root of 404605381 is about 739.6232444218.

The spelling of 404605381 in words is "four hundred four million, six hundred five thousand, three hundred eighty-one".