1808964 has 36 divisors (see below), whose sum is σ = 4624620. Its totient is φ = 596160.

The previous prime is 1808959. The next prime is 1808969. The reversal of 1808964 is 4698081.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1808959) and next prime (1808969).

It can be written as a sum of positive squares in 2 ways, for example, as 921600 + 887364 = 960^2 + 942^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1808969) 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, 3694 + ... + 4154.

2^1808964 is an apocalyptic number.

It is an amenable number.

1808964 is an abundant number, since it is smaller than the sum of its proper divisors (2815656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1808964 is a wasteful number, since it uses less digits than its factorization.

1808964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580 (or 575 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 1808964 is about 1344.9773232289. The cubic root of 1808964 is about 121.8456347397.

It can be divided in two parts, 1808 and 964, that added together give a palindrome (2772).

The spelling of 1808964 in words is "one million, eight hundred eight thousand, nine hundred sixty-four".