1157993686 has 8 divisors (see below), whose sum is σ = 1737196920. Its totient is φ = 578928048.

The previous prime is 1157993677. The next prime is 1157993687. The reversal of 1157993686 is 6863997511.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1157993687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9856 + ... + 49123.

It is an arithmetic number, because the mean of its divisors is an integer number (217149615).

Almost surely, 2^1157993686 is an apocalyptic number.

1157993686 is a deficient number, since it is larger than the sum of its proper divisors (579203234).

1157993686 is an equidigital number, since it uses as much as digits as its factorization.

1157993686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68798.

The product of its digits is 2449440, while the sum is 55.

The square root of 1157993686 is about 34029.3062814980. The cubic root of 1157993686 is about 1050.1114578584. Note that the first 3 decimals are identical.

The spelling of 1157993686 in words is "one billion, one hundred fifty-seven million, nine hundred ninety-three thousand, six hundred eighty-six".