1989853 has 4 divisors (see below), whose sum is σ = 2038428. Its totient is φ = 1941280.

The previous prime is 1989847. The next prime is 1989863. The reversal of 1989853 is 3589891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3589891 = 661 ⋅5431.

It can be written as a sum of positive squares in 2 ways, for example, as 870489 + 1119364 = 933^2 + 1058^2 .

It is a cyclic number.

It is not a de Polignac number, because 1989853 - 2⁹ = 1989341 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989803) 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, 24226 + ... + 24307.

It is an arithmetic number, because the mean of its divisors is an integer number (509607).

2^1989853 is an apocalyptic number.

It is an amenable number.

1989853 is a deficient number, since it is larger than the sum of its proper divisors (48575).

1989853 is an equidigital number, since it uses as much as digits as its factorization.

1989853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48574.

The product of its digits is 77760, while the sum is 43.

The square root of 1989853 is about 1410.6214942358. The cubic root of 1989853 is about 125.7786699791.

The spelling of 1989853 in words is "one million, nine hundred eighty-nine thousand, eight hundred fifty-three".