1638363 has 6 divisors (see below), whose sum is σ = 2187444. Its totient is φ = 1090764.

The previous prime is 1638353. The next prime is 1638431. The reversal of 1638363 is 3638361.

It is not a de Polignac number, because 1638363 - 2⁴ = 1638347 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 1638363.

It is not an unprimeable number, because it can be changed into a prime (1638353) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1848 + ... + 2586.

It is an arithmetic number, because the mean of its divisors is an integer number (364574).

2^1638363 is an apocalyptic number.

1638363 is a deficient number, since it is larger than the sum of its proper divisors (549081).

1638363 is an frugal number, since it uses more digits than its factorization.

1638363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1481 (or 742 counting only the distinct ones).

The product of its digits is 7776, while the sum is 30.

The square root of 1638363 is about 1279.9855467934. The cubic root of 1638363 is about 117.8881205203. Note that the first 3 decimals are identical.

The spelling of 1638363 in words is "one million, six hundred thirty-eight thousand, three hundred sixty-three".