1983557 has 4 divisors (see below), whose sum is σ = 1989120. Its totient is φ = 1977996.

The previous prime is 1983523. The next prime is 1983559. The reversal of 1983557 is 7553891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1983557 - 2⁶ = 1983493 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1983557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1983559) 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, 2207 + ... + 2972.

It is an arithmetic number, because the mean of its divisors is an integer number (497280).

2^1983557 is an apocalyptic number.

It is an amenable number.

1983557 is a deficient number, since it is larger than the sum of its proper divisors (5563).

1983557 is an equidigital number, since it uses as much as digits as its factorization.

1983557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5562.

The product of its digits is 37800, while the sum is 38.

The square root of 1983557 is about 1408.3880857207. The cubic root of 1983557 is about 125.6458730364.

The spelling of 1983557 in words is "one million, nine hundred eighty-three thousand, five hundred fifty-seven".