1181941638 has 16 divisors (see below), whose sum is σ = 2372299056. Its totient is φ = 392577920.

The previous prime is 1181941637. The next prime is 1181941667. The reversal of 1181941638 is 8361491811.

It is a self number, because there is not a number n which added to its sum of digits gives 1181941638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1181941637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 348831 + ... + 352202.

It is an arithmetic number, because the mean of its divisors is an integer number (148268691).

Almost surely, 2^1181941638 is an apocalyptic number.

1181941638 is an abundant number, since it is smaller than the sum of its proper divisors (1190357418).

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

1181941638 is a wasteful number, since it uses less digits than its factorization.

1181941638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701319.

The product of its digits is 41472, while the sum is 42.

The square root of 1181941638 is about 34379.3780921063. The cubic root of 1181941638 is about 1057.3010840366.

The spelling of 1181941638 in words is "one billion, one hundred eighty-one million, nine hundred forty-one thousand, six hundred thirty-eight".