1864864 has 24 divisors (see below), whose sum is σ = 3714228. Its totient is φ = 921600.

The previous prime is 1864861. The next prime is 1864871. The reversal of 1864864 is 4684681.

It can be written as a sum of positive squares in 2 ways, for example, as 1192464 + 672400 = 1092^2 + 820^2 .

It is an Ulam number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (1864861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2944 + ... + 3520.

2^1864864 is an apocalyptic number.

It is an amenable number.

1864864 is a deficient number, since it is larger than the sum of its proper divisors (1849364).

1864864 is a wasteful number, since it uses less digits than its factorization.

1864864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688 (or 680 counting only the distinct ones).

The product of its digits is 36864, while the sum is 37.

The square root of 1864864 is about 1365.6002343292. The cubic root of 1864864 is about 123.0880018873.

It can be divided in two parts, 186 and 4864, that added together give a triangular number (5050 = T₁₀₀).

The spelling of 1864864 in words is "one million, eight hundred sixty-four thousand, eight hundred sixty-four".