1187520820 has 48 divisors (see below), whose sum is σ = 2605639680. Its totient is φ = 453758976.

The previous prime is 1187520793. The next prime is 1187520821. The reversal of 1187520820 is 280257811.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1187520821) 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 15 ways as a sum of consecutive naturals, for example, 529261 + ... + 531499.

It is an arithmetic number, because the mean of its divisors is an integer number (54284160).

Almost surely, 2^1187520820 is an apocalyptic number.

1187520820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1187520820 is an abundant number, since it is smaller than the sum of its proper divisors (1418118860).

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

1187520820 is a wasteful number, since it uses less digits than its factorization.

1187520820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3424 (or 3422 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 34.

The square root of 1187520820 is about 34460.4239672120. The cubic root of 1187520820 is about 1058.9620847887.

The spelling of 1187520820 in words is "one billion, one hundred eighty-seven million, five hundred twenty thousand, eight hundred twenty".