404667649 has 4 divisors (see below), whose sum is σ = 404716036. Its totient is φ = 404619264.

The previous prime is 404667647. The next prime is 404667661. The reversal of 404667649 is 946766404.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 260499600 + 144168049 = 16140^2 + 12007^2 .

It is a 3-Lehmer number, since φ(404667649) divides (404667649-1)³.

It is a cyclic number.

It is not a de Polignac number, because 404667649 - 2¹ = 404667647 is a prime.

It is a super-2 number, since 2×404667649² = 327511812294374402, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 404667599 and 404667608.

It is not an unprimeable number, because it can be changed into a prime (404667647) 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, 8064 + ... + 29569.

It is an arithmetic number, because the mean of its divisors is an integer number (101179009).

Almost surely, 2^404667649 is an apocalyptic number.

404667649 is the 10753-rd nonagonal number.

It is an amenable number.

404667649 is a deficient number, since it is larger than the sum of its proper divisors (48387).

404667649 is a wasteful number, since it uses less digits than its factorization.

404667649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48386.

The product of its (nonzero) digits is 870912, while the sum is 46.

The square root of 404667649 is about 20116.3527757892. The cubic root of 404667649 is about 739.6611846799.

The spelling of 404667649 in words is "four hundred four million, six hundred sixty-seven thousand, six hundred forty-nine".