10400666 has 8 divisors (see below), whose sum is σ = 15798720. Its totient is φ = 5134428.

The previous prime is 10400659. The next prime is 10400681. The reversal of 10400666 is 66600401.

10400666 = 80² + 81² + ... + 316².

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32756 + ... + 33071.

It is an arithmetic number, because the mean of its divisors is an integer number (1974840).

Almost surely, 2^10400666 is an apocalyptic number.

10400666 is a deficient number, since it is larger than the sum of its proper divisors (5398054).

10400666 is an equidigital number, since it uses as much as digits as its factorization.

10400666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65908.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 10400666 is about 3225.0063565829. The cubic root of 10400666 is about 218.2832359208.

The spelling of 10400666 in words is "ten million, four hundred thousand, six hundred sixty-six".