1187288020 has 24 divisors (see below), whose sum is σ = 2495178504. Its totient is φ = 474558336.

The previous prime is 1187287999. The next prime is 1187288023. The reversal of 1187288020 is 208827811.

It can be written as a sum of positive squares in 4 ways, for example, as 141800464 + 1045487556 = 11908^2 + 32334^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1187288023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5842 + ... + 49078.

It is an arithmetic number, because the mean of its divisors is an integer number (103965771).

Almost surely, 2^1187288020 is an apocalyptic number.

1187288020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1187288020 is an abundant number, since it is smaller than the sum of its proper divisors (1307890484).

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

1187288020 is a wasteful number, since it uses less digits than its factorization.

1187288020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44619 (or 44617 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 37.

The square root of 1187288020 is about 34457.0460138416. The cubic root of 1187288020 is about 1058.8928810941.

The spelling of 1187288020 in words is "one billion, one hundred eighty-seven million, two hundred eighty-eight thousand, twenty".