1161856978 has 8 divisors (see below), whose sum is σ = 1744110720. Its totient is φ = 580486740.

The previous prime is 1161856963. The next prime is 1161856987. The reversal of 1161856978 is 8796581611.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217578 + ... + 222853.

It is an arithmetic number, because the mean of its divisors is an integer number (218013840).

Almost surely, 2^1161856978 is an apocalyptic number.

1161856978 is a deficient number, since it is larger than the sum of its proper divisors (582253742).

1161856978 is a wasteful number, since it uses less digits than its factorization.

1161856978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441752.

The product of its digits is 725760, while the sum is 52.

The square root of 1161856978 is about 34086.0232060004. The cubic root of 1161856978 is about 1051.2779535728.

The spelling of 1161856978 in words is "one billion, one hundred sixty-one million, eight hundred fifty-six thousand, nine hundred seventy-eight".