402648669 has 6 divisors (see below), whose sum is σ = 581603646. Its totient is φ = 268432440.

The previous prime is 402648661. The next prime is 402648683. The reversal of 402648669 is 966846204.

It can be written as a sum of positive squares in only one way, i.e., 311063769 + 91584900 = 17637^2 + 9570^2 .

It is not a de Polignac number, because 402648669 - 2³ = 402648661 is a prime.

It is a super-2 number, since 2×402648669² = 324251901294943122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402648661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22369362 + ... + 22369379.

It is an arithmetic number, because the mean of its divisors is an integer number (96933941).

Almost surely, 2^402648669 is an apocalyptic number.

It is an amenable number.

402648669 is a deficient number, since it is larger than the sum of its proper divisors (178954977).

402648669 is a wasteful number, since it uses less digits than its factorization.

402648669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44738747 (or 44738744 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The square root of 402648669 is about 20066.1074700601. The cubic root of 402648669 is about 738.4290199448.

The spelling of 402648669 in words is "four hundred two million, six hundred forty-eight thousand, six hundred sixty-nine".