1166440540 has 72 divisors (see below), whose sum is σ = 2568398112. Its totient is φ = 444568320.

The previous prime is 1166440537. The next prime is 1166440543. The reversal of 1166440540 is 450446611.

It is an interprime number because it is at equal distance from previous prime (1166440537) and next prime (1166440543).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166440543) 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, 7828386 + ... + 7828534.

It is an arithmetic number, because the mean of its divisors is an integer number (35672196).

Almost surely, 2^1166440540 is an apocalyptic number.

1166440540 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 1166440540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1284199056).

1166440540 is an abundant number, since it is smaller than the sum of its proper divisors (1401957572).

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

1166440540 is a wasteful number, since it uses less digits than its factorization.

1166440540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415 (or 264 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 1166440540 is about 34153.1922373297. The cubic root of 1166440540 is about 1052.6585810556.

The spelling of 1166440540 in words is "one billion, one hundred sixty-six million, four hundred forty thousand, five hundred forty".