1864280 has 64 divisors (see below), whose sum is σ = 4838400. Its totient is φ = 639360.

The previous prime is 1864267. The next prime is 1864297. The reversal of 1864280 is 824681.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8249 + ... + 8471.

It is an arithmetic number, because the mean of its divisors is an integer number (75600).

2^1864280 is an apocalyptic number.

1864280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1864280 is the 1115-th pentagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1864280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2419200).

1864280 is an abundant number, since it is smaller than the sum of its proper divisors (2974120).

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

1864280 is a wasteful number, since it uses less digits than its factorization.

1864280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264 (or 260 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 1864280 is about 1365.3863921982. The cubic root of 1864280 is about 123.0751518175.

The spelling of 1864280 in words is "one million, eight hundred sixty-four thousand, two hundred eighty".