400330666 has 4 divisors (see below), whose sum is σ = 600496002. Its totient is φ = 200165332.

The previous prime is 400330661. The next prime is 400330673. The reversal of 400330666 is 666033004.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 224370441 + 175960225 = 14979^2 + 13265^2 .

It is not an unprimeable number, because it can be changed into a prime (400330661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100082665 + ... + 100082668.

Almost surely, 2^400330666 is an apocalyptic number.

400330666 is a deficient number, since it is larger than the sum of its proper divisors (200165336).

400330666 is a wasteful number, since it uses less digits than its factorization.

400330666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200165335.

The product of its (nonzero) digits is 7776, while the sum is 28.

The square root of 400330666 is about 20008.2649422682. The cubic root of 400330666 is about 737.0092744676.

The spelling of 400330666 in words is "four hundred million, three hundred thirty thousand, six hundred sixty-six".