1121979600 has 720 divisors, whose sum is σ = 4936434048. Its totient is φ = 238878720.

The previous prime is 1121979581. The next prime is 1121979611. The reversal of 1121979600 is 69791211.

It is a tau number, because it is divible by the number of its divisors (720).

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 143 ways as a sum of consecutive naturals, for example, 11566752 + ... + 11566848.

Almost surely, 2^1121979600 is an apocalyptic number.

1121979600 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 1121979600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2468217024).

1121979600 is an abundant number, since it is smaller than the sum of its proper divisors (3814454448).

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

1121979600 is a wasteful number, since it uses less digits than its factorization.

1121979600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154 (or 131 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 36.

The square root of 1121979600 is about 33495.9639359729. The cubic root of 1121979600 is about 1039.1103091311.

The spelling of 1121979600 in words is "one billion, one hundred twenty-one million, nine hundred seventy-nine thousand, six hundred".