1115629920 has 144 divisors (see below), whose sum is σ = 3910168080. Its totient is φ = 289446912.

The previous prime is 1115629909. The next prime is 1115629937. The reversal of 1115629920 is 299265111.

1115629920 is a `hidden beast` number, since 1 + 1 + 1 + 5 + 629 + 9 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

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 polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42811 + ... + 63749.

It is an arithmetic number, because the mean of its divisors is an integer number (27153945).

Almost surely, 2^1115629920 is an apocalyptic number.

1115629920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1115629920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1955084040).

1115629920 is an abundant number, since it is smaller than the sum of its proper divisors (2794538160).

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

1115629920 is a wasteful number, since it uses less digits than its factorization.

1115629920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20997 (or 20986 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 1115629920 is about 33401.0466901862. The cubic root of 1115629920 is about 1037.1463684706.

The spelling of 1115629920 in words is "one billion, one hundred fifteen million, six hundred twenty-nine thousand, nine hundred twenty".