1149988140 has 144 divisors (see below), whose sum is σ = 3998711808. Its totient is φ = 262058112.

The previous prime is 1149988111. The next prime is 1149988141. The reversal of 1149988140 is 418899411.

1149988140 is a `hidden beast` number, since 11 + 499 + 8 + 8 + 140 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1149988141) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 481389 + ... + 483771.

It is an arithmetic number, because the mean of its divisors is an integer number (27768832).

Almost surely, 2^1149988140 is an apocalyptic number.

1149988140 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 1149988140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1999355904).

1149988140 is an abundant number, since it is smaller than the sum of its proper divisors (2848723668).

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

1149988140 is a wasteful number, since it uses less digits than its factorization.

1149988140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2788 (or 2783 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 45.

The square root of 1149988140 is about 33911.4750490155. The cubic root of 1149988140 is about 1047.6859515366.

The spelling of 1149988140 in words is "one billion, one hundred forty-nine million, nine hundred eighty-eight thousand, one hundred forty".