1968553 has 4 divisors (see below), whose sum is σ = 1983060. Its totient is φ = 1954048.

The previous prime is 1968541. The next prime is 1968563. The reversal of 1968553 is 3558691.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1172889 + 795664 = 1083^2 + 892^2 .

It is a cyclic number.

It is not a de Polignac number, because 1968553 - 2⁵ = 1968521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1968563) 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, 7048 + ... + 7321.

It is an arithmetic number, because the mean of its divisors is an integer number (495765).

2^1968553 is an apocalyptic number.

It is an amenable number.

1968553 is a deficient number, since it is larger than the sum of its proper divisors (14507).

1968553 is a wasteful number, since it uses less digits than its factorization.

1968553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14506.

The product of its digits is 32400, while the sum is 37.

The square root of 1968553 is about 1403.0513176645. The cubic root of 1968553 is about 125.3282678339.

The spelling of 1968553 in words is "one million, nine hundred sixty-eight thousand, five hundred fifty-three".