1864980 has 72 divisors (see below), whose sum is σ = 6099912. Its totient is φ = 458496.

The previous prime is 1864979. The next prime is 1864987. The reversal of 1864980 is 894681.

It is a happy number.

1864980 is a `hidden beast` number, since 1 + 8 + 649 + 8 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 26244 + 1838736 = 162^2 + 1356^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1864987) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1942 + ... + 2738.

It is an arithmetic number, because the mean of its divisors is an integer number (84721).

2^1864980 is an apocalyptic number.

1864980 is a gapful number since it is divisible by the number (10) 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 1864980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3049956).

1864980 is an abundant number, since it is smaller than the sum of its proper divisors (4234932).

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

1864980 is a wasteful number, since it uses less digits than its factorization.

1864980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825 (or 820 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 1864980 is about 1365.6427058349. The cubic root of 1864980 is about 123.0905539791.

Subtracting from 1864980 its reverse (894681), we obtain a cube (970299 = 99³).

The spelling of 1864980 in words is "one million, eight hundred sixty-four thousand, nine hundred eighty".