400004665 has 8 divisors (see below), whose sum is σ = 480115008. Its totient is φ = 319930800.

The previous prime is 400004653. The next prime is 400004783. The reversal of 400004665 is 566400004.

It is a happy number.

400004665 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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

It is a de Polignac number, because none of the positive numbers 2^k-400004665 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31314 + ... + 42196.

It is an arithmetic number, because the mean of its divisors is an integer number (60014376).

Almost surely, 2^400004665 is an apocalyptic number.

It is an amenable number.

400004665 is a deficient number, since it is larger than the sum of its proper divisors (80110343).

400004665 is a wasteful number, since it uses less digits than its factorization.

400004665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18239.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 400004665 is about 20000.1166246600. The cubic root of 400004665 is about 736.8091640514.

Adding to 400004665 its reverse (566400004), we get a palindrome (966404669).

The spelling of 400004665 in words is "four hundred million, four thousand, six hundred sixty-five".