1957823 has 4 divisors (see below), whose sum is σ = 2237520. Its totient is φ = 1678128.

The previous prime is 1957801. The next prime is 1957831. The reversal of 1957823 is 3287591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3287591 = 211 ⋅15581.

It is a cyclic number.

It is not a de Polignac number, because 1957823 - 2⁶ = 1957759 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 (1957853) 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, 139838 + ... + 139851.

It is an arithmetic number, because the mean of its divisors is an integer number (559380).

2^1957823 is an apocalyptic number.

1957823 is a deficient number, since it is larger than the sum of its proper divisors (279697).

1957823 is an equidigital number, since it uses as much as digits as its factorization.

1957823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279696.

The product of its digits is 15120, while the sum is 35.

The square root of 1957823 is about 1399.2222839849. Note that the first 4 decimals coincide. The cubic root of 1957823 is about 125.1001437484.

The spelling of 1957823 in words is "one million, nine hundred fifty-seven thousand, eight hundred twenty-three".