1990228 has 6 divisors (see below), whose sum is σ = 3482906. Its totient is φ = 995112.

The previous prime is 1990223. The next prime is 1990229. The reversal of 1990228 is 8220991.

It can be written as a sum of positive squares in only one way, i.e., 1468944 + 521284 = 1212^2 + 722^2 .

It is a super-2 number, since 2×1990228² = 7922014983968, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1990228.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 248775 + ... + 248782.

2^1990228 is an apocalyptic number.

It is an amenable number.

1990228 is a deficient number, since it is larger than the sum of its proper divisors (1492678).

1990228 is a wasteful number, since it uses less digits than its factorization.

1990228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497561 (or 497559 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 1990228 is about 1410.7544081094. The cubic root of 1990228 is about 125.7865707367.

The spelling of 1990228 in words is "one million, nine hundred ninety thousand, two hundred twenty-eight".