1801581240 has 64 divisors (see below), whose sum is σ = 5457254400. Its totient is φ = 475754112.

The previous prime is 1801581227. The next prime is 1801581253. The reversal of 1801581240 is 421851081.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1801581227) and next prime (1801581253).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1801581198 and 1801581207.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60520 + ... + 85239.

It is an arithmetic number, because the mean of its divisors is an integer number (85269600).

Almost surely, 2^1801581240 is an apocalyptic number.

1801581240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1801581240 is an abundant number, since it is smaller than the sum of its proper divisors (3655673160).

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

1801581240 is a wasteful number, since it uses less digits than its factorization.

1801581240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145876 (or 145872 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 30.

The square root of 1801581240 is about 42445.0378725240. The cubic root of 1801581240 is about 1216.7964956429.

The spelling of 1801581240 in words is "one billion, eight hundred one million, five hundred eighty-one thousand, two hundred forty".