1121399064 has 96 divisors (see below), whose sum is σ = 3121232400. Its totient is φ = 363525120.

The previous prime is 1121399047. The next prime is 1121399089. The reversal of 1121399064 is 4609931211.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 869332 + ... + 870620.

Almost surely, 2^1121399064 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1121399064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1560616200).

1121399064 is an abundant number, since it is smaller than the sum of its proper divisors (1999833336).

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

1121399064 is a wasteful number, since it uses less digits than its factorization.

1121399064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1625 (or 1618 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 1121399064 is about 33487.2970542563. The cubic root of 1121399064 is about 1038.9310589869.

The spelling of 1121399064 in words is "one billion, one hundred twenty-one million, three hundred ninety-nine thousand, sixty-four".