402749668 has 6 divisors (see below), whose sum is σ = 704811926. Its totient is φ = 201374832.

The previous prime is 402749657. The next prime is 402749681. The reversal of 402749668 is 866947204.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 225540324 + 177209344 = 15018^2 + 13312^2 .

It is a super-2 number, since 2×402749668² = 324414590148220448, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50343705 + ... + 50343712.

Almost surely, 2^402749668 is an apocalyptic number.

It is an amenable number.

402749668 is a deficient number, since it is larger than the sum of its proper divisors (302062258).

402749668 is a wasteful number, since it uses less digits than its factorization.

402749668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100687421 (or 100687419 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 46.

The square root of 402749668 is about 20068.6239687727. The cubic root of 402749668 is about 738.4907564439.

The spelling of 402749668 in words is "four hundred two million, seven hundred forty-nine thousand, six hundred sixty-eight".