1990456 has 16 divisors (see below), whose sum is σ = 4019400. Its totient is φ = 918624.

The previous prime is 1990453. The next prime is 1990463. The reversal of 1990456 is 6540991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9466 + ... + 9673.

2^1990456 is an apocalyptic number.

It is an amenable number.

1990456 is an abundant number, since it is smaller than the sum of its proper divisors (2028944).

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

1990456 is a wasteful number, since it uses less digits than its factorization.

1990456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19158 (or 19154 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 1990456 is about 1410.8352136235. The cubic root of 1990456 is about 125.7913739122.

The spelling of 1990456 in words is "one million, nine hundred ninety thousand, four hundred fifty-six".