1608921 has 12 divisors (see below), whose sum is σ = 2368548. Its totient is φ = 1052064.

The previous prime is 1608913. The next prime is 1608941. The reversal of 1608921 is 1298061.

It can be written as a sum of positive squares in 2 ways, for example, as 1440000 + 168921 = 1200^2 + 411^2 .

It is not a de Polignac number, because 1608921 - 2³ = 1608913 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (1608911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1210 + ... + 2163.

It is an arithmetic number, because the mean of its divisors is an integer number (197379).

2^1608921 is an apocalyptic number.

It is an amenable number.

1608921 is a deficient number, since it is larger than the sum of its proper divisors (759627).

1608921 is a wasteful number, since it uses less digits than its factorization.

1608921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3432 (or 3429 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 1608921 is about 1268.4324972185. The cubic root of 1608921 is about 117.1776831243.

It can be divided in two parts, 16089 and 21, that added together give a triangular number (16110 = T₁₇₉).

The spelling of 1608921 in words is "one million, six hundred eight thousand, nine hundred twenty-one".