1187428572 has 120 divisors (see below), whose sum is σ = 3444376320. Its totient is φ = 353665440.

The previous prime is 1187428559. The next prime is 1187428573. The reversal of 1187428572 is 2758247811.

1187428572 is a `hidden beast` number, since 1 + 1 + 8 + 74 + 2 + 8 + 572 = 666.

1187428572 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1187428572² = 2819973227203918368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1187428573) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 207453 + ... + 213099.

It is an arithmetic number, because the mean of its divisors is an integer number (28703136).

Almost surely, 2^1187428572 is an apocalyptic number.

1187428572 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 1187428572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1722188160).

1187428572 is an abundant number, since it is smaller than the sum of its proper divisors (2256947748).

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

1187428572 is a wasteful number, since it uses less digits than its factorization.

1187428572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5733 (or 5722 counting only the distinct ones).

The product of its digits is 250880, while the sum is 45.

The square root of 1187428572 is about 34459.0854782886. The cubic root of 1187428572 is about 1058.9346636094.

The spelling of 1187428572 in words is "one billion, one hundred eighty-seven million, four hundred twenty-eight thousand, five hundred seventy-two".