400220280 has 48 divisors (see below), whose sum is σ = 1300717080. Its totient is φ = 106725312.

The previous prime is 400220209. The next prime is 400220281. The reversal of 400220280 is 82022004.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400220281) 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, 555502 + ... + 556221.

Almost surely, 2^400220280 is an apocalyptic number.

400220280 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400220280 is an abundant number, since it is smaller than the sum of its proper divisors (900496800).

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

400220280 is a wasteful number, since it uses less digits than its factorization.

400220280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111740 (or 1111733 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 400220280 is about 20005.5062420325. The cubic root of 400220280 is about 736.9415279841.

Adding to 400220280 its reverse (82022004), we get a palindrome (482242284).

The spelling of 400220280 in words is "four hundred million, two hundred twenty thousand, two hundred eighty".