1181984820 has 48 divisors (see below), whose sum is σ = 3342342528. Its totient is φ = 312073600.

The previous prime is 1181984801. The next prime is 1181984821. The reversal of 1181984820 is 284891811.

It is a super-2 number, since 2×1181984820² = 2794176229420864800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1181984821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91464 + ... + 103583.

It is an arithmetic number, because the mean of its divisors is an integer number (69632136).

Almost surely, 2^1181984820 is an apocalyptic number.

1181984820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1181984820 is an abundant number, since it is smaller than the sum of its proper divisors (2160357708).

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

1181984820 is a wasteful number, since it uses less digits than its factorization.

1181984820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195160 (or 195158 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 42.

The square root of 1181984820 is about 34380.0061082019. The cubic root of 1181984820 is about 1057.3139599740.

The spelling of 1181984820 in words is "one billion, one hundred eighty-one million, nine hundred eighty-four thousand, eight hundred twenty".