400381200660 has 96 divisors (see below), whose sum is σ = 1293194004480. Its totient is φ = 90660405888.

The previous prime is 400381200641. The next prime is 400381200673. The reversal of 400381200660 is 66002183004.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4409680 + ... + 4499559.

It is an arithmetic number, because the mean of its divisors is an integer number (13470770880).

Almost surely, 2^400381200660 is an apocalyptic number.

It is an amenable number.

400381200660 is an abundant number, since it is smaller than the sum of its proper divisors (892812803820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400381200660 is a wasteful number, since it uses less digits than its factorization.

400381200660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8909365 (or 8909363 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

Adding to 400381200660 its reverse (66002183004), we get a palindrome (466383383664).

The spelling of 400381200660 in words is "four hundred billion, three hundred eighty-one million, two hundred thousand, six hundred sixty".