1181979138 has 16 divisors (see below), whose sum is σ = 2386052640. Its totient is φ = 390310656.

The previous prime is 1181979109. The next prime is 1181979143. The reversal of 1181979138 is 8319791811.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 919903 + ... + 921186.

It is an arithmetic number, because the mean of its divisors is an integer number (149128290).

Almost surely, 2^1181979138 is an apocalyptic number.

1181979138 is an abundant number, since it is smaller than the sum of its proper divisors (1204073502).

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

1181979138 is a wasteful number, since it uses less digits than its factorization.

1181979138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1841201.

The product of its digits is 108864, while the sum is 48.

The square root of 1181979138 is about 34379.9234728642. The cubic root of 1181979138 is about 1057.3122657425.

The spelling of 1181979138 in words is "one billion, one hundred eighty-one million, nine hundred seventy-nine thousand, one hundred thirty-eight".