1187778972 has 48 divisors (see below), whose sum is σ = 2946585600. Its totient is φ = 371562048.

The previous prime is 1187778961. The next prime is 1187779027. The reversal of 1187778972 is 2798777811.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25972 + ... + 55227.

It is an arithmetic number, because the mean of its divisors is an integer number (61387200).

Almost surely, 2^1187778972 is an apocalyptic number.

1187778972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1187778972 is an abundant number, since it is smaller than the sum of its proper divisors (1758806628).

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

1187778972 is a wasteful number, since it uses less digits than its factorization.

1187778972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81282 (or 81280 counting only the distinct ones).

The product of its digits is 2765952, while the sum is 57.

The square root of 1187778972 is about 34464.1693937341. The cubic root of 1187778972 is about 1059.0388142149.

The spelling of 1187778972 in words is "one billion, one hundred eighty-seven million, seven hundred seventy-eight thousand, nine hundred seventy-two".