1811964 has 96 divisors (see below), whose sum is σ = 5515776. Its totient is φ = 449280.

The previous prime is 1811959. The next prime is 1811983. The reversal of 1811964 is 4691181.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34162 + ... + 34214.

It is an arithmetic number, because the mean of its divisors is an integer number (57456).

2^1811964 is an apocalyptic number.

1811964 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1811964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2757888).

1811964 is an abundant number, since it is smaller than the sum of its proper divisors (3703812).

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

1811964 is a wasteful number, since it uses less digits than its factorization.

1811964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115 (or 113 counting only the distinct ones).

The product of its digits is 1728, while the sum is 30.

The square root of 1811964 is about 1346.0921216618. The cubic root of 1811964 is about 121.9129541226.

It can be divided in two parts, 1811 and 964, that added together give a triangular number (2775 = T₇₄).

The spelling of 1811964 in words is "one million, eight hundred eleven thousand, nine hundred sixty-four".