1138631642 has 8 divisors (see below), whose sum is σ = 1708137396. Its totient is φ = 569252512.

The previous prime is 1138631621. The next prime is 1138631647. The reversal of 1138631642 is 2461368311.

It can be written as a sum of positive squares in 2 ways, for example, as 970384801 + 168246841 = 31151^2 + 12971^2 .

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 (1138631647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4523 + ... + 47934.

Almost surely, 2^1138631642 is an apocalyptic number.

1138631642 is a deficient number, since it is larger than the sum of its proper divisors (569505754).

1138631642 is a wasteful number, since it uses less digits than its factorization.

1138631642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63312.

The product of its digits is 20736, while the sum is 35.

The square root of 1138631642 is about 33743.6163147935. The cubic root of 1138631642 is about 1044.2257925578.

Adding to 1138631642 its reverse (2461368311), we get a palindrome (3599999953).

The spelling of 1138631642 in words is "one billion, one hundred thirty-eight million, six hundred thirty-one thousand, six hundred forty-two".