1189969920 has 256 divisors, whose sum is σ = 4246668000. Its totient is φ = 316145664.

The previous prime is 1189969909. The next prime is 1189969931. The reversal of 1189969920 is 299699811.

It is an interprime number because it is at equal distance from previous prime (1189969909) and next prime (1189969931).

It is a tau number, because it is divible by the number of its divisors (256).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4423546 + ... + 4423814.

Almost surely, 2^1189969920 is an apocalyptic number.

1189969920 is a gapful number since it is divisible by the number (10) 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 1189969920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2123334000).

1189969920 is an abundant number, since it is smaller than the sum of its proper divisors (3056698080).

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

1189969920 is an frugal number, since it uses more digits than its factorization.

1189969920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313 (or 279 counting only the distinct ones).

The product of its (nonzero) digits is 629856, while the sum is 54.

The square root of 1189969920 is about 34495.9406307467. The cubic root of 1189969920 is about 1059.6895732734.

The spelling of 1189969920 in words is "one billion, one hundred eighty-nine million, nine hundred sixty-nine thousand, nine hundred twenty".