1638914 has 4 divisors (see below), whose sum is σ = 2458374. Its totient is φ = 819456.

The previous prime is 1638913. The next prime is 1638929. The reversal of 1638914 is 4198361.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4198361 = 31 ⋅135431.

It can be written as a sum of positive squares in only one way, i.e., 1050625 + 588289 = 1025^2 + 767^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1638913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409727 + ... + 409730.

2^1638914 is an apocalyptic number.

1638914 is a deficient number, since it is larger than the sum of its proper divisors (819460).

1638914 is an equidigital number, since it uses as much as digits as its factorization.

1638914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819459.

The product of its digits is 5184, while the sum is 32.

The square root of 1638914 is about 1280.2007655052. The cubic root of 1638914 is about 117.9013347417.

It can be divided in two parts, 1638 and 914, that added together give a palindrome (2552).

The spelling of 1638914 in words is "one million, six hundred thirty-eight thousand, nine hundred fourteen".