1638116 has 6 divisors (see below), whose sum is σ = 2866710. Its totient is φ = 819056.

The previous prime is 1638107. The next prime is 1638121. The reversal of 1638116 is 6118361.

It can be written as a sum of positive squares in only one way, i.e., 1081600 + 556516 = 1040^2 + 746^2 .

It is a plaindrome in base 15.

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 as a sum of consecutive naturals, namely, 204761 + ... + 204768.

It is an arithmetic number, because the mean of its divisors is an integer number (477785).

2^1638116 is an apocalyptic number.

It is an amenable number.

1638116 is a deficient number, since it is larger than the sum of its proper divisors (1228594).

1638116 is a wasteful number, since it uses less digits than its factorization.

1638116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409533 (or 409531 counting only the distinct ones).

The product of its digits is 864, while the sum is 26.

The square root of 1638116 is about 1279.8890576921. The cubic root of 1638116 is about 117.8821959421.

The spelling of 1638116 in words is "one million, six hundred thirty-eight thousand, one hundred sixteen".