404440202381 has 2 divisors, whose sum is σ = 404440202382. Its totient is φ = 404440202380.

The previous prime is 404440202333. The next prime is 404440202401. The reversal of 404440202381 is 183202044404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 402039692356 + 2400510025 = 634066^2 + 48995^2 .

It is a cyclic number.

It is not a de Polignac number, because 404440202381 - 2²⁶ = 404373093517 is a prime.

It is a super-2 number, since 2×404440202381² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404440202281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202220101190 + 202220101191.

It is an arithmetic number, because the mean of its divisors is an integer number (202220101191).

Almost surely, 2^404440202381 is an apocalyptic number.

It is an amenable number.

404440202381 is a deficient number, since it is larger than the sum of its proper divisors (1).

404440202381 is an equidigital number, since it uses as much as digits as its factorization.

404440202381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24576, while the sum is 32.

Adding to 404440202381 its reverse (183202044404), we get a palindrome (587642246785).

The spelling of 404440202381 in words is "four hundred four billion, four hundred forty million, two hundred two thousand, three hundred eighty-one".