1138421818 has 8 divisors (see below), whose sum is σ = 1747345248. Its totient is φ = 555973404.

The previous prime is 1138421807. The next prime is 1138421819. The reversal of 1138421818 is 8181248311.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1138421819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6618646 + ... + 6618817.

It is an arithmetic number, because the mean of its divisors is an integer number (218418156).

Almost surely, 2^1138421818 is an apocalyptic number.

1138421818 is a deficient number, since it is larger than the sum of its proper divisors (608923430).

1138421818 is a wasteful number, since it uses less digits than its factorization.

1138421818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13237508.

The product of its digits is 12288, while the sum is 37.

The square root of 1138421818 is about 33740.5070797699. The cubic root of 1138421818 is about 1044.1616462368.

The spelling of 1138421818 in words is "one billion, one hundred thirty-eight million, four hundred twenty-one thousand, eight hundred eighteen".