400220000 has 60 divisors (see below), whose sum is σ = 984650436. Its totient is φ = 160080000.

The previous prime is 400219979. The next prime is 400220003. The reversal of 400220000 is 22004.

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a self number, because there is not a number n which added to its sum of digits gives 400220000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400220003) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 9995 + ... + 30005.

Almost surely, 2^400220000 is an apocalyptic number.

400220000 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 400220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (492325218).

400220000 is an abundant number, since it is smaller than the sum of its proper divisors (584430436).

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

400220000 is an equidigital number, since it uses as much as digits as its factorization.

400220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20041 (or 20018 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 8.

The square root of 400220000 is about 20005.4992439579. The cubic root of 400220000 is about 736.9413561257.

Adding to 400220000 its reverse (22004), we get a palindrome (400242004).

The spelling of 400220000 in words is "four hundred million, two hundred twenty thousand".