404147681 has 8 divisors (see below), whose sum is σ = 489052800. Its totient is φ = 326035008.

The previous prime is 404147677. The next prime is 404147717. The reversal of 404147681 is 186741404.

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

It is a cyclic number.

It is not a de Polignac number, because 404147681 - 2² = 404147677 is a prime.

It is a super-2 number, since 2×404147681² = 326670696115355522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (404147621) 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, 1697981 + ... + 1698218.

It is an arithmetic number, because the mean of its divisors is an integer number (61131600).

Almost surely, 2^404147681 is an apocalyptic number.

It is an amenable number.

404147681 is a deficient number, since it is larger than the sum of its proper divisors (84905119).

404147681 is a wasteful number, since it uses less digits than its factorization.

404147681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3396223.

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 404147681 is about 20103.4246087576. The cubic root of 404147681 is about 739.3442455876.

The spelling of 404147681 in words is "four hundred four million, one hundred forty-seven thousand, six hundred eighty-one".