1990864 has 10 divisors (see below), whose sum is σ = 3857330. Its totient is φ = 995424.

The previous prime is 1990831. The next prime is 1990867. The reversal of 1990864 is 4680991.

It can be written as a sum of positive squares in only one way, i.e., 1166400 + 824464 = 1080^2 + 908^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62199 + ... + 62230.

It is an arithmetic number, because the mean of its divisors is an integer number (385733).

2^1990864 is an apocalyptic number.

It is an amenable number.

1990864 is a deficient number, since it is larger than the sum of its proper divisors (1866466).

1990864 is a wasteful number, since it uses less digits than its factorization.

1990864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124437 (or 124431 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 1990864 is about 1410.9798014146. The cubic root of 1990864 is about 125.7999681529.

The spelling of 1990864 in words is "one million, nine hundred ninety thousand, eight hundred sixty-four".