1863638 has 8 divisors (see below), whose sum is σ = 3194832. Its totient is φ = 798696.

The previous prime is 1863637. The next prime is 1863647. The reversal of 1863638 is 8363681.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1863598 and 1863607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1863637) 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, 66545 + ... + 66572.

It is an arithmetic number, because the mean of its divisors is an integer number (399354).

2^1863638 is an apocalyptic number.

1863638 is a deficient number, since it is larger than the sum of its proper divisors (1331194).

1863638 is a wasteful number, since it uses less digits than its factorization.

1863638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133126.

The product of its digits is 20736, while the sum is 35.

The square root of 1863638 is about 1365.1512736690. The cubic root of 1863638 is about 123.0610224450.

The spelling of 1863638 in words is "one million, eight hundred sixty-three thousand, six hundred thirty-eight".