400550000 has 60 divisors (see below), whose sum is σ = 970141032. Its totient is φ = 160200000.

The previous prime is 400549969. The next prime is 400550009. The reversal of 400550000 is 55004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400550009) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45995 + ... + 54005.

Almost surely, 2^400550000 is an apocalyptic number.

400550000 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 400550000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (485070516).

400550000 is an abundant number, since it is smaller than the sum of its proper divisors (569591032).

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

400550000 is an frugal number, since it uses more digits than its factorization.

400550000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8044 (or 8018 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 14.

The square root of 400550000 is about 20013.7452766842. The cubic root of 400550000 is about 737.1438479531.

The spelling of 400550000 in words is "four hundred million, five hundred fifty thousand".