1801764 has 60 divisors (see below), whose sum is σ = 4838064. Its totient is φ = 584496.

The previous prime is 1801759. The next prime is 1801769. The reversal of 1801764 is 4671081.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1801759) and next prime (1801769).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1801769) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 21667 + ... + 21749.

2^1801764 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1801764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2419032).

1801764 is an abundant number, since it is smaller than the sum of its proper divisors (3036300).

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

1801764 is a wasteful number, since it uses less digits than its factorization.

1801764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166 (or 155 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 1801764 is about 1342.2980295002. The cubic root of 1801764 is about 121.6837639908.

It can be divided in two parts, 18017 and 64, that added together give a palindrome (18081).

The spelling of 1801764 in words is "one million, eight hundred one thousand, seven hundred sixty-four".