1187722872 has 128 divisors (see below), whose sum is σ = 3780633600. Its totient is φ = 338442624.

The previous prime is 1187722847. The next prime is 1187722919. The reversal of 1187722872 is 2782277811.

1187722872 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 735538 + ... + 737150.

It is an arithmetic number, because the mean of its divisors is an integer number (29536200).

Almost surely, 2^1187722872 is an apocalyptic number.

1187722872 is a gapful number since it is divisible by the number (12) 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 1187722872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1890316800).

1187722872 is an abundant number, since it is smaller than the sum of its proper divisors (2592910728).

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

1187722872 is a wasteful number, since it uses less digits than its factorization.

1187722872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2122 (or 2112 counting only the distinct ones).

The product of its digits is 175616, while the sum is 45.

The square root of 1187722872 is about 34463.3554953664. The cubic root of 1187722872 is about 1059.0221407949.

The spelling of 1187722872 in words is "one billion, one hundred eighty-seven million, seven hundred twenty-two thousand, eight hundred seventy-two".