1121971860 has 72 divisors (see below), whose sum is σ = 3427875360. Its totient is φ = 297033408.

The previous prime is 1121971859. The next prime is 1121971889. The reversal of 1121971860 is 681791211.

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, 2599 + ... + 47441.

It is an arithmetic number, because the mean of its divisors is an integer number (47609380).

Almost surely, 2^1121971860 is an apocalyptic number.

1121971860 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 1121971860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1713937680).

1121971860 is an abundant number, since it is smaller than the sum of its proper divisors (2305903500).

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

1121971860 is a wasteful number, since it uses less digits than its factorization.

1121971860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44997 (or 44992 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 36.

The square root of 1121971860 is about 33495.8483994659. The cubic root of 1121971860 is about 1039.1079196842.

The spelling of 1121971860 in words is "one billion, one hundred twenty-one million, nine hundred seventy-one thousand, eight hundred sixty".