2115540 has 144 divisors (see below), whose sum is σ = 7757568. Its totient is φ = 456192.

The previous prime is 2115539. The next prime is 2115571. The reversal of 2115540 is 455112.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28944 + ... + 29016.

It is an arithmetic number, because the mean of its divisors is an integer number (53872).

2^2115540 is an apocalyptic number.

2115540 is a gapful number since it is divisible by the number (20) 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 2115540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3878784).

2115540 is an abundant number, since it is smaller than the sum of its proper divisors (5642028).

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

2115540 is a wasteful number, since it uses less digits than its factorization.

2115540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118 (or 113 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 2115540 is about 1454.4896012004. The cubic root of 2115540 is about 128.3730167190.

The spelling of 2115540 in words is "two million, one hundred fifteen thousand, five hundred forty".