1189973988 has 72 divisors (see below), whose sum is σ = 3479181888. Its totient is φ = 335890368.

The previous prime is 1189973947. The next prime is 1189973989. The reversal of 1189973988 is 8893799811.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (1189973989) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7531 + ... + 49362.

Almost surely, 2^1189973988 is an apocalyptic number.

1189973988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1189973988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1739590944).

1189973988 is an abundant number, since it is smaller than the sum of its proper divisors (2289207900).

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

1189973988 is a wasteful number, since it uses less digits than its factorization.

1189973988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56993 (or 56988 counting only the distinct ones).

The product of its digits is 7838208, while the sum is 63.

The square root of 1189973988 is about 34495.9995941558. Note that the first 3 decimals coincide. The cubic root of 1189973988 is about 1059.6907808144.

The spelling of 1189973988 in words is "one billion, one hundred eighty-nine million, nine hundred seventy-three thousand, nine hundred eighty-eight".