400840228 has 18 divisors (see below), whose sum is σ = 733299014. Its totient is φ = 191705184.

The previous prime is 400840189. The next prime is 400840241. The reversal of 400840228 is 822048004.

It can be written as a sum of positive squares in only one way, i.e., 394896384 + 5943844 = 19872^2 + 2438^2 .

It is a junction number, because it is equal to n+sod(n) for n = 400840196 and 400840205.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 92601 + ... + 96832.

Almost surely, 2^400840228 is an apocalyptic number.

It is an amenable number.

400840228 is a deficient number, since it is larger than the sum of its proper divisors (332458786).

400840228 is a wasteful number, since it uses less digits than its factorization.

400840228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189483 (or 189458 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 28.

The square root of 400840228 is about 20020.9946805847. The cubic root of 400840228 is about 737.3218433209.

The spelling of 400840228 in words is "four hundred million, eight hundred forty thousand, two hundred twenty-eight".