1990636 has 6 divisors (see below), whose sum is σ = 3483620. Its totient is φ = 995316.

The previous prime is 1990621. The next prime is 1990643. The reversal of 1990636 is 6360991.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 248826 + ... + 248833.

2^1990636 is an apocalyptic number.

It is an amenable number.

1990636 is a deficient number, since it is larger than the sum of its proper divisors (1492984).

1990636 is a wasteful number, since it uses less digits than its factorization.

1990636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497663 (or 497661 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 1990636 is about 1410.8990041814. The cubic root of 1990636 is about 125.7951656337.

The spelling of 1990636 in words is "one million, nine hundred ninety thousand, six hundred thirty-six".