1990899 has 14 divisors (see below), whose sum is σ = 2986076. Its totient is φ = 1326780.

The previous prime is 1990889. The next prime is 1990907. The reversal of 1990899 is 9980991.

It is not a de Polignac number, because 1990899 - 2⁴ = 1990883 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (1990829) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 637 + ... + 2094.

2^1990899 is an apocalyptic number.

1990899 is a deficient number, since it is larger than the sum of its proper divisors (995177).

1990899 is an frugal number, since it uses more digits than its factorization.

1990899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2749 (or 2734 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The square root of 1990899 is about 1410.9922040890. The cubic root of 1990899 is about 125.8007053493.

The spelling of 1990899 in words is "one million, nine hundred ninety thousand, eight hundred ninety-nine".