1990554 has 24 divisors (see below), whose sum is σ = 4206240. Its totient is φ = 627912.

The previous prime is 1990553. The next prime is 1990559. The reversal of 1990554 is 4550991.

It is not an unprimeable number, because it can be changed into a prime (1990553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1707 + ... + 2625.

It is an arithmetic number, because the mean of its divisors is an integer number (175260).

2^1990554 is an apocalyptic number.

1990554 is an abundant number, since it is smaller than the sum of its proper divisors (2215686).

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

1990554 is a wasteful number, since it uses less digits than its factorization.

1990554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 962 (or 943 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 33.

The square root of 1990554 is about 1410.8699443960. The cubic root of 1990554 is about 125.7934383223.

The spelling of 1990554 in words is "one million, nine hundred ninety thousand, five hundred fifty-four".