400866800 has 120 divisors (see below), whose sum is σ = 1028746656. Its totient is φ = 149585920.

The previous prime is 400866779. The next prime is 400866803. The reversal of 400866800 is 8668004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400866803) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1135424 + ... + 1135776.

Almost surely, 2^400866800 is an apocalyptic number.

400866800 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400866800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (514373328).

400866800 is an abundant number, since it is smaller than the sum of its proper divisors (627879856).

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

400866800 is a wasteful number, since it uses less digits than its factorization.

400866800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555 (or 544 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 400866800 is about 20021.6582729803. The cubic root of 400866800 is about 737.3381355007.

The spelling of 400866800 in words is "four hundred million, eight hundred sixty-six thousand, eight hundred".