404629681 has 8 divisors (see below), whose sum is σ = 426366720. Its totient is φ = 382936752.

The previous prime is 404629661. The next prime is 404629703. The reversal of 404629681 is 186926404.

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 404629681 - 2⁵ = 404629649 is a prime.

It is a super-2 number, since 2×404629681² = 327450357492323522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (404629651) 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, 8736 + ... + 29758.

It is an arithmetic number, because the mean of its divisors is an integer number (53295840).

Almost surely, 2^404629681 is an apocalyptic number.

It is an amenable number.

404629681 is a deficient number, since it is larger than the sum of its proper divisors (21737039).

404629681 is a wasteful number, since it uses less digits than its factorization.

404629681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22055.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 404629681 is about 20115.4090438151. The cubic root of 404629681 is about 739.6380510176.

The spelling of 404629681 in words is "four hundred four million, six hundred twenty-nine thousand, six hundred eighty-one".