1820860 has 24 divisors (see below), whose sum is σ = 3852576. Its totient is φ = 722880.

The previous prime is 1820857. The next prime is 1820869. The reversal of 1820860 is 680281.

It is a super-2 number, since 2×1820860² = 6631062279200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3369 + ... + 3871.

It is an arithmetic number, because the mean of its divisors is an integer number (160524).

2^1820860 is an apocalyptic number.

1820860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1820860 is an abundant number, since it is smaller than the sum of its proper divisors (2031716).

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

1820860 is a wasteful number, since it uses less digits than its factorization.

1820860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693 (or 691 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 1820860 is about 1349.3924558852. The cubic root of 1820860 is about 122.1121426986.

The spelling of 1820860 in words is "one million, eight hundred twenty thousand, eight hundred sixty".