1992638 has 16 divisors (see below), whose sum is σ = 3201120. Its totient is φ = 926976.

The previous prime is 1992637. The next prime is 1992643. The reversal of 1992638 is 8362991.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1992631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3218 + ... + 3786.

It is an arithmetic number, because the mean of its divisors is an integer number (200070).

2^1992638 is an apocalyptic number.

1992638 is a deficient number, since it is larger than the sum of its proper divisors (1208482).

1992638 is a wasteful number, since it uses less digits than its factorization.

1992638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691.

The product of its digits is 23328, while the sum is 38.

The square root of 1992638 is about 1411.6083026109. The cubic root of 1992638 is about 125.8373226030.

The spelling of 1992638 in words is "one million, nine hundred ninety-two thousand, six hundred thirty-eight".