404742490 has 16 divisors (see below), whose sum is σ = 729055080. Its totient is φ = 161781760.

The previous prime is 404742463. The next prime is 404742493. The reversal of 404742490 is 94247404.

It can be written as a sum of positive squares in 4 ways, for example, as 307897209 + 96845281 = 17547^2 + 9841^2 .

It is a super-2 number, since 2×404742490² = 327632966422800200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (404742493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1146 + ... + 28474.

Almost surely, 2^404742490 is an apocalyptic number.

404742490 is a deficient number, since it is larger than the sum of its proper divisors (324312590).

404742490 is a wasteful number, since it uses less digits than its factorization.

404742490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28817.

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 404742490 is about 20118.2128927994. The cubic root of 404742490 is about 739.7067805910.

Adding to 404742490 its reverse (94247404), we get a palindrome (498989894).

The spelling of 404742490 in words is "four hundred four million, seven hundred forty-two thousand, four hundred ninety".