1864240 has 40 divisors (see below), whose sum is σ = 4955040. Its totient is φ = 638976.

The previous prime is 1864217. The next prime is 1864241. The reversal of 1864240 is 424681.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (1864241) 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, 1105 + ... + 2224.

It is an arithmetic number, because the mean of its divisors is an integer number (123876).

2^1864240 is an apocalyptic number.

1864240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1864240 is an abundant number, since it is smaller than the sum of its proper divisors (3090800).

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

1864240 is a wasteful number, since it uses less digits than its factorization.

1864240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3349 (or 3343 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 1864240 is about 1365.3717442514. The cubic root of 1864240 is about 123.0742715775.

The spelling of 1864240 in words is "one million, eight hundred sixty-four thousand, two hundred forty".