1229180638 has 16 divisors (see below), whose sum is σ = 2109219840. Its totient is φ = 526278456.

The previous prime is 1229180633. The next prime is 1229180669. The reversal of 1229180638 is 8360819221.

It is a self number, because there is not a number n which added to its sum of digits gives 1229180638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1229180633) 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 7 ways as a sum of consecutive naturals, for example, 27706 + ... + 56797.

It is an arithmetic number, because the mean of its divisors is an integer number (131826240).

Almost surely, 2^1229180638 is an apocalyptic number.

1229180638 is a deficient number, since it is larger than the sum of its proper divisors (880039202).

1229180638 is a wasteful number, since it uses less digits than its factorization.

1229180638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85551.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 1229180638 is about 35059.6725312716. The cubic root of 1229180638 is about 1071.2033040348.

Adding to 1229180638 its reverse (8360819221), we get a palindrome (9589999859).

It can be divided in two parts, 12291 and 80638, that added together give a palindrome (92929).

The spelling of 1229180638 in words is "one billion, two hundred twenty-nine million, one hundred eighty thousand, six hundred thirty-eight".