1187013780 has 72 divisors (see below), whose sum is σ = 3812418792. Its totient is φ = 297916416.

The previous prime is 1187013767. The next prime is 1187013781. The reversal of 1187013780 is 873107811.

It can be written as a sum of positive squares in 4 ways, for example, as 43086096 + 1143927684 = 6564^2 + 33822^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1187013781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 190897 + ... + 197016.

It is an arithmetic number, because the mean of its divisors is an integer number (52950261).

Almost surely, 2^1187013780 is an apocalyptic number.

1187013780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1187013780 is an abundant number, since it is smaller than the sum of its proper divisors (2625405012).

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

1187013780 is a wasteful number, since it uses less digits than its factorization.

1187013780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387945 (or 387940 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 36.

The square root of 1187013780 is about 34453.0663366848. The cubic root of 1187013780 is about 1058.8113470603.

The spelling of 1187013780 in words is "one billion, one hundred eighty-seven million, thirteen thousand, seven hundred eighty".