404420381 has 2 divisors, whose sum is σ = 404420382. Its totient is φ = 404420380.

The previous prime is 404420363. The next prime is 404420503. The reversal of 404420381 is 183024404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 404412100 + 8281 = 20110^2 + 91^2 .

It is a cyclic number.

It is not a de Polignac number, because 404420381 - 2¹⁰ = 404419357 is a prime.

It is a super-2 number, since 2×404420381² = 327111689136370322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 404420381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404420311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202210190 + 202210191.

It is an arithmetic number, because the mean of its divisors is an integer number (202210191).

Almost surely, 2^404420381 is an apocalyptic number.

It is an amenable number.

404420381 is a deficient number, since it is larger than the sum of its proper divisors (1).

404420381 is an equidigital number, since it uses as much as digits as its factorization.

404420381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 404420381 is about 20110.2058915368. The cubic root of 404420381 is about 739.5104998674.

Adding to 404420381 its reverse (183024404), we get a palindrome (587444785).

The spelling of 404420381 in words is "four hundred four million, four hundred twenty thousand, three hundred eighty-one".