404854642 has 8 divisors (see below), whose sum is σ = 615601116. Its totient is φ = 199654272.

The previous prime is 404854627. The next prime is 404854649. The reversal of 404854642 is 246458404.

It is a happy number.

It is a Cunningham number, because it is equal to 20121²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 404854641 + 1 = 20121^2 + 1^2 .

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

It is a super-2 number, since 2×404854642² = 327814562297896328, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (404854649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1386343 + ... + 1386634.

Almost surely, 2^404854642 is an apocalyptic number.

404854642 is a deficient number, since it is larger than the sum of its proper divisors (210746474).

404854642 is a wasteful number, since it uses less digits than its factorization.

404854642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2773052.

The product of its (nonzero) digits is 122880, while the sum is 37.

The square root of 404854642 is about 20121.0000248497. Note that the first 4 decimals coincide. The cubic root of 404854642 is about 739.7750972248.

The spelling of 404854642 in words is "four hundred four million, eight hundred fifty-four thousand, six hundred forty-two".