1992791 has 4 divisors (see below), whose sum is σ = 2110032. Its totient is φ = 1875552.

The previous prime is 1992779. The next prime is 1992797. The reversal of 1992791 is 1972991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1972991 = 131 ⋅15061.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1992791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1992797) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58595 + ... + 58628.

It is an arithmetic number, because the mean of its divisors is an integer number (527508).

2^1992791 is an apocalyptic number.

1992791 is a deficient number, since it is larger than the sum of its proper divisors (117241).

1992791 is a wasteful number, since it uses less digits than its factorization.

1992791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117240.

The product of its digits is 10206, while the sum is 38.

The square root of 1992791 is about 1411.6624950745. The cubic root of 1992791 is about 125.8405432278.

The spelling of 1992791 in words is "one million, nine hundred ninety-two thousand, seven hundred ninety-one".