400421860 has 12 divisors (see below), whose sum is σ = 840885948. Its totient is φ = 160168736.

The previous prime is 400421809. The next prime is 400421897. The reversal of 400421860 is 68124004.

It can be written as a sum of positive squares in 2 ways, for example, as 186267904 + 214153956 = 13648^2 + 14634^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10010527 + ... + 10010566.

It is an arithmetic number, because the mean of its divisors is an integer number (70073829).

Almost surely, 2^400421860 is an apocalyptic number.

It is an amenable number.

400421860 is an abundant number, since it is smaller than the sum of its proper divisors (440464088).

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

400421860 is a wasteful number, since it uses less digits than its factorization.

400421860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20021102 (or 20021100 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 400421860 is about 20010.5437207488. The cubic root of 400421860 is about 737.0652329761.

Adding to 400421860 its reverse (68124004), we get a palindrome (468545864).

The spelling of 400421860 in words is "four hundred million, four hundred twenty-one thousand, eight hundred sixty".