16115540 has 48 divisors (see below), whose sum is σ = 39591552. Its totient is φ = 5394816.

The previous prime is 16115537. The next prime is 16115543. The reversal of 16115540 is 4551161.

It is an interprime number because it is at equal distance from previous prime (16115537) and next prime (16115543).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16115543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4682 + ... + 7358.

It is an arithmetic number, because the mean of its divisors is an integer number (824824).

Almost surely, 2^16115540 is an apocalyptic number.

16115540 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 16115540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19795776).

16115540 is an abundant number, since it is smaller than the sum of its proper divisors (23476012).

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

16115540 is a wasteful number, since it uses less digits than its factorization.

16115540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2736 (or 2734 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 16115540 is about 4014.4165204921. The cubic root of 16115540 is about 252.5893027911.

The spelling of 16115540 in words is "sixteen million, one hundred fifteen thousand, five hundred forty".