1111997790 has 48 divisors (see below), whose sum is σ = 3016903968. Its totient is φ = 283639488.

The previous prime is 1111997771. The next prime is 1111997791. The reversal of 1111997790 is 977991111.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111997791) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 266529 + ... + 270668.

It is an arithmetic number, because the mean of its divisors is an integer number (62852166).

Almost surely, 2^1111997790 is an apocalyptic number.

1111997790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1111997790 is an abundant number, since it is smaller than the sum of its proper divisors (1904906178).

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

1111997790 is a wasteful number, since it uses less digits than its factorization.

1111997790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537233 (or 537230 counting only the distinct ones).

The product of its (nonzero) digits is 35721, while the sum is 45.

The square root of 1111997790 is about 33346.6308643017. The cubic root of 1111997790 is about 1036.0196071432.

The spelling of 1111997790 in words is "one billion, one hundred eleven million, nine hundred ninety-seven thousand, seven hundred ninety".