1149789420 has 288 divisors, whose sum is σ = 3909814272. Its totient is φ = 271724544.

The previous prime is 1149789401. The next prime is 1149789439. The reversal of 1149789420 is 249879411.

It is a happy number.

1149789420 is a `hidden beast` number, since 1 + 149 + 7 + 89 + 420 = 666.

It is an interprime number because it is at equal distance from previous prime (1149789401) and next prime (1149789439).

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

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 9053397 + ... + 9053523.

It is an arithmetic number, because the mean of its divisors is an integer number (13575744).

Almost surely, 2^1149789420 is an apocalyptic number.

1149789420 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 1149789420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1954907136).

1149789420 is an abundant number, since it is smaller than the sum of its proper divisors (2760024852).

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

1149789420 is a wasteful number, since it uses less digits than its factorization.

1149789420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281 (or 276 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 1149789420 is about 33908.5449407668. The cubic root of 1149789420 is about 1047.6256007271.

The spelling of 1149789420 in words is "one billion, one hundred forty-nine million, seven hundred eighty-nine thousand, four hundred twenty".