1990308 has 24 divisors (see below), whose sum is σ = 4721920. Its totient is φ = 652320.

The previous prime is 1990279. The next prime is 1990319. The reversal of 1990308 is 8030991.

It is a happy number.

It is a super-2 number, since 2×1990308² = 7922651869728, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 628 + ... + 2091.

2^1990308 is an apocalyptic number.

It is an amenable number.

1990308 is an abundant number, since it is smaller than the sum of its proper divisors (2731612).

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

1990308 is a wasteful number, since it uses less digits than its factorization.

1990308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2787 (or 2785 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 1990308 is about 1410.7827614484. The cubic root of 1990308 is about 125.7882561032.

The spelling of 1990308 in words is "one million, nine hundred ninety thousand, three hundred eight".