1165423840 has 144 divisors (see below), whose sum is σ = 3278266992. Its totient is φ = 390168576.

The previous prime is 1165423813. The next prime is 1165423867. The reversal of 1165423840 is 483245611.

It is an interprime number because it is at equal distance from previous prime (1165423813) and next prime (1165423867).

It is a junction number, because it is equal to n+sod(n) for n = 1165423796 and 1165423805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 335392 + ... + 338848.

It is an arithmetic number, because the mean of its divisors is an integer number (22765743).

Almost surely, 2^1165423840 is an apocalyptic number.

1165423840 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 1165423840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1639133496).

1165423840 is an abundant number, since it is smaller than the sum of its proper divisors (2112843152).

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

1165423840 is a wasteful number, since it uses less digits than its factorization.

1165423840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3529 (or 3514 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 1165423840 is about 34138.3045859047. The cubic root of 1165423840 is about 1052.3526505938.

The spelling of 1165423840 in words is "one billion, one hundred sixty-five million, four hundred twenty-three thousand, eight hundred forty".