1638226 has 8 divisors (see below), whose sum is σ = 2536704. Its totient is φ = 792660.

The previous prime is 1638211. The next prime is 1638251. The reversal of 1638226 is 6228361.

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 = 1638194 and 1638203.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13150 + ... + 13273.

It is an arithmetic number, because the mean of its divisors is an integer number (317088).

2^1638226 is an apocalyptic number.

1638226 is the 810-th centered pentagonal number.

1638226 is a deficient number, since it is larger than the sum of its proper divisors (898478).

1638226 is a wasteful number, since it uses less digits than its factorization.

1638226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26456.

The product of its digits is 3456, while the sum is 28.

The square root of 1638226 is about 1279.9320294453. The cubic root of 1638226 is about 117.8848344918.

The spelling of 1638226 in words is "one million, six hundred thirty-eight thousand, two hundred twenty-six".