1983553 has 18 divisors (see below), whose sum is σ = 2385222. Its totient is φ = 1647360.

The previous prime is 1983523. The next prime is 1983559. The reversal of 1983553 is 3553891.

It can be written as a sum of positive squares in 3 ways, for example, as 1089 + 1982464 = 33^2 + 1408^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1983553 is a prime.

It is a Duffinian 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 17 ways as a sum of consecutive naturals, for example, 20401 + ... + 20497.

2^1983553 is an apocalyptic number.

1983553 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1983553 is a deficient number, since it is larger than the sum of its proper divisors (401669).

1983553 is a wasteful number, since it uses less digits than its factorization.

1983553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145 (or 121 counting only the distinct ones).

The product of its digits is 16200, while the sum is 34.

The square root of 1983553 is about 1408.3866656568. The cubic root of 1983553 is about 125.6457885780.

The spelling of 1983553 in words is "one million, nine hundred eighty-three thousand, five hundred fifty-three".