1163998720 has 160 divisors (see below), whose sum is σ = 2975113152. Its totient is φ = 435781632.

The previous prime is 1163998711. The next prime is 1163998727. The reversal of 1163998720 is 278993611.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1163998727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3120454 + ... + 3120826.

Almost surely, 2^1163998720 is an apocalyptic number.

1163998720 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 1163998720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1487556576).

1163998720 is an abundant number, since it is smaller than the sum of its proper divisors (1811114432).

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

1163998720 is an equidigital number, since it uses as much as digits as its factorization.

1163998720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472 (or 456 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 1163998720 is about 34117.4254597266. The cubic root of 1163998720 is about 1051.9235247313.

The spelling of 1163998720 in words is "one billion, one hundred sixty-three million, nine hundred ninety-eight thousand, seven hundred twenty".