1997783 has 4 divisors (see below), whose sum is σ = 2020320. Its totient is φ = 1975248.

The previous prime is 1997773. The next prime is 1997813. The reversal of 1997783 is 3877991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3877991 = 13 ⋅298307.

It is a cyclic number.

It is not a de Polignac number, because 1997783 - 2⁶ = 1997719 is a prime.

It is a super-2 number, since 2×1997783² = 7982273830178, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997713) 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, 11135 + ... + 11312.

It is an arithmetic number, because the mean of its divisors is an integer number (505080).

2^1997783 is an apocalyptic number.

1997783 is a deficient number, since it is larger than the sum of its proper divisors (22537).

1997783 is an equidigital number, since it uses as much as digits as its factorization.

1997783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22536.

The product of its digits is 95256, while the sum is 44.

The square root of 1997783 is about 1413.4295171674. The cubic root of 1997783 is about 125.9455336944.

It can be divided in two parts, 1997 and 783, that multiplied together give a palindrome (1563651).

The spelling of 1997783 in words is "one million, nine hundred ninety-seven thousand, seven hundred eighty-three".