400490228 has 6 divisors (see below), whose sum is σ = 700857906. Its totient is φ = 200245112.

The previous prime is 400490221. The next prime is 400490231. The reversal of 400490228 is 822094004.

It can be written as a sum of positive squares in only one way, i.e., 367565584 + 32924644 = 19172^2 + 5738^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 400490228.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400490221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50061275 + ... + 50061282.

It is an arithmetic number, because the mean of its divisors is an integer number (116809651).

Almost surely, 2^400490228 is an apocalyptic number.

It is an amenable number.

400490228 is a deficient number, since it is larger than the sum of its proper divisors (300367678).

400490228 is a wasteful number, since it uses less digits than its factorization.

400490228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100122561 (or 100122559 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 400490228 is about 20012.2519472447. The cubic root of 400490228 is about 737.1071794107.

The spelling of 400490228 in words is "four hundred million, four hundred ninety thousand, two hundred twenty-eight".