1863864 has 32 divisors (see below), whose sum is σ = 5178000. Its totient is φ = 621216.

The previous prime is 1863857. The next prime is 1863871. The reversal of 1863864 is 4683681.

It is a happy number.

1863864 is a `hidden beast` number, since 18 + 638 + 6 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (1863857) and next prime (1863871).

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

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4099 + ... + 4530.

2^1863864 is an apocalyptic number.

It is an amenable number.

1863864 is an abundant number, since it is smaller than the sum of its proper divisors (3314136).

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

1863864 is a wasteful number, since it uses less digits than its factorization.

1863864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8644 (or 8634 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 1863864 is about 1365.2340458691. The cubic root of 1863864 is about 123.0659967063.

The spelling of 1863864 in words is "one million, eight hundred sixty-three thousand, eight hundred sixty-four".