1166997790 has 32 divisors (see below), whose sum is σ = 2478127104. Its totient is φ = 387205920.

The previous prime is 1166997781. The next prime is 1166997817. The reversal of 1166997790 is 977996611.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 266724 + ... + 271063.

It is an arithmetic number, because the mean of its divisors is an integer number (77441472).

Almost surely, 2^1166997790 is an apocalyptic number.

1166997790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1166997790 is an abundant number, since it is smaller than the sum of its proper divisors (1311129314).

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

1166997790 is a wasteful number, since it uses less digits than its factorization.

1166997790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537832.

The product of its (nonzero) digits is 1285956, while the sum is 55.

The square root of 1166997790 is about 34161.3493585953. The cubic root of 1166997790 is about 1052.8261851430.

The spelling of 1166997790 in words is "one billion, one hundred sixty-six million, nine hundred ninety-seven thousand, seven hundred ninety".