404021394 has 24 divisors (see below), whose sum is σ = 1000434240. Its totient is φ = 115434648.

The previous prime is 404021369. The next prime is 404021411. The reversal of 404021394 is 493120404.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1603134 + ... + 1603385.

It is an arithmetic number, because the mean of its divisors is an integer number (41684760).

Almost surely, 2^404021394 is an apocalyptic number.

404021394 is an abundant number, since it is smaller than the sum of its proper divisors (596412846).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

404021394 is a wasteful number, since it uses less digits than its factorization.

404021394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3206534 (or 3206531 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 404021394 is about 20100.2834308375. The cubic root of 404021394 is about 739.2672281192.

Adding to 404021394 its reverse (493120404), we get a palindrome (897141798).

The spelling of 404021394 in words is "four hundred four million, twenty-one thousand, three hundred ninety-four".