801540 has 72 divisors (see below), whose sum is σ = 2505048. Its totient is φ = 207360.

The previous prime is 801539. The next prime is 801551. The reversal of 801540 is 45108.

It can be written as a sum of positive squares in 4 ways, for example, as 2304 + 799236 = 48^2 + 894^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10944 + ... + 11016.

2⁸⁰¹⁵⁴⁰ 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 801540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1252524).

801540 is an abundant number, since it is smaller than the sum of its proper divisors (1703508).

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

801540 is a wasteful number, since it uses less digits than its factorization.

801540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149 (or 144 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 801540 is about 895.2876632681. The cubic root of 801540 is about 92.8913055476.

Adding to 801540 its reverse (45108), we get a palindrome (846648).

The spelling of 801540 in words is "eight hundred one thousand, five hundred forty".