402400066 has 8 divisors (see below), whose sum is σ = 604252620. Its totient is φ = 200982528.

The previous prime is 402400039. The next prime is 402400067. The reversal of 402400066 is 660004204.

It can be written as a sum of positive squares in 2 ways, for example, as 326344225 + 76055841 = 18065^2 + 8721^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (402400067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106431 + ... + 110146.

Almost surely, 2^402400066 is an apocalyptic number.

402400066 is a deficient number, since it is larger than the sum of its proper divisors (201852554).

402400066 is a wasteful number, since it uses less digits than its factorization.

402400066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217508.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 402400066 is about 20059.9119140638. The cubic root of 402400066 is about 738.2770152503.

The spelling of 402400066 in words is "four hundred two million, four hundred thousand, sixty-six".