404081381 has 16 divisors (see below), whose sum is σ = 475564608. Its totient is φ = 339206400.

The previous prime is 404081371. The next prime is 404081399. The reversal of 404081381 is 183180404.

It is a cyclic number.

It is not a de Polignac number, because 404081381 - 2⁶ = 404081317 is a prime.

It is a super-2 number, since 2×404081381² = 326563524941734322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404081351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10475 + ... + 30296.

It is an arithmetic number, because the mean of its divisors is an integer number (29722788).

Almost surely, 2^404081381 is an apocalyptic number.

It is an amenable number.

404081381 is a deficient number, since it is larger than the sum of its proper divisors (71483227).

404081381 is a wasteful number, since it uses less digits than its factorization.

404081381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40852.

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 404081381 is about 20101.7755683422. The cubic root of 404081381 is about 739.3038138291.

The spelling of 404081381 in words is "four hundred four million, eighty-one thousand, three hundred eighty-one".