1990331 has 12 divisors (see below), whose sum is σ = 2339280. Its totient is φ = 1688400.

The previous prime is 1990327. The next prime is 1990337. The reversal of 1990331 is 1330991.

It is not a de Polignac number, because 1990331 - 2² = 1990327 is a prime.

It is a super-2 number, since 2×1990331² = 7922834979122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1990331.

It is not an unprimeable number, because it can be changed into a prime (1990337) 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, 7265 + ... + 7533.

It is an arithmetic number, because the mean of its divisors is an integer number (194940).

2^1990331 is an apocalyptic number.

1990331 is a deficient number, since it is larger than the sum of its proper divisors (348949).

1990331 is a wasteful number, since it uses less digits than its factorization.

1990331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434 (or 427 counting only the distinct ones).

The product of its (nonzero) digits is 729, while the sum is 26.

The square root of 1990331 is about 1410.7909129279. The cubic root of 1990331 is about 125.7887406377.

The spelling of 1990331 in words is "one million, nine hundred ninety thousand, three hundred thirty-one".