1118689638 has 32 divisors (see below), whose sum is σ = 2569242240. Its totient is φ = 321154560.

The previous prime is 1118689631. The next prime is 1118689639. The reversal of 1118689638 is 8369868111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1118689631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 444795 + ... + 447302.

It is an arithmetic number, because the mean of its divisors is an integer number (80288820).

Almost surely, 2^1118689638 is an apocalyptic number.

1118689638 is an abundant number, since it is smaller than the sum of its proper divisors (1450552602).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1118689638 is a wasteful number, since it uses less digits than its factorization.

1118689638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892132.

The product of its digits is 497664, while the sum is 51.

The square root of 1118689638 is about 33446.8180549361. The cubic root of 1118689638 is about 1038.0936595260.

The spelling of 1118689638 in words is "one billion, one hundred eighteen million, six hundred eighty-nine thousand, six hundred thirty-eight".