404721634 has 4 divisors (see below), whose sum is σ = 607082454. Its totient is φ = 202360816.

The previous prime is 404721617. The next prime is 404721643. The reversal of 404721634 is 436127404.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 374306409 + 30415225 = 19347^2 + 5515^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 404721596 and 404721605.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101180407 + ... + 101180410.

Almost surely, 2^404721634 is an apocalyptic number.

404721634 is a deficient number, since it is larger than the sum of its proper divisors (202360820).

404721634 is a wasteful number, since it uses less digits than its factorization.

404721634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202360819.

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 404721634 is about 20117.6945498235. The cubic root of 404721634 is about 739.6940749078.

The spelling of 404721634 in words is "four hundred four million, seven hundred twenty-one thousand, six hundred thirty-four".