1157993978 has 8 divisors (see below), whose sum is σ = 1737945120. Its totient is φ = 578678940.

The previous prime is 1157993971. The next prime is 1157994053. The reversal of 1157993978 is 8793997511.

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 (1157993971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154448 + ... + 161771.

It is an arithmetic number, because the mean of its divisors is an integer number (217243140).

Almost surely, 2^1157993978 is an apocalyptic number.

1157993978 is a deficient number, since it is larger than the sum of its proper divisors (579951142).

1157993978 is a wasteful number, since it uses less digits than its factorization.

1157993978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318052.

The product of its digits is 4286520, while the sum is 59.

The square root of 1157993978 is about 34029.3105719173. The cubic root of 1157993978 is about 1050.1115461238. Note that the first 3 decimals are identical.

The spelling of 1157993978 in words is "one billion, one hundred fifty-seven million, nine hundred ninety-three thousand, nine hundred seventy-eight".