404031021 has 8 divisors (see below), whose sum is σ = 539277120. Its totient is φ = 269069472.

The previous prime is 404031013. The next prime is 404031049. The reversal of 404031021 is 120130404.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 404031021 - 2³ = 404031013 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404031011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67801 + ... + 73518.

It is an arithmetic number, because the mean of its divisors is an integer number (67409640).

Almost surely, 2^404031021 is an apocalyptic number.

It is an amenable number.

404031021 is a deficient number, since it is larger than the sum of its proper divisors (135246099).

404031021 is a wasteful number, since it uses less digits than its factorization.

404031021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142275.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 404031021 is about 20100.5229036461. The cubic root of 404031021 is about 739.2730998124.

Adding to 404031021 its reverse (120130404), we get a palindrome (524161425).

The spelling of 404031021 in words is "four hundred four million, thirty-one thousand, twenty-one".