2215542 has 64 divisors (see below), whose sum is σ = 5598720. Its totient is φ = 569856.

The previous prime is 2215541. The next prime is 2215547. The reversal of 2215542 is 2455122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2215541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20653 + ... + 20759.

It is an arithmetic number, because the mean of its divisors is an integer number (87480).

2^2215542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2215542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2799360).

2215542 is an abundant number, since it is smaller than the sum of its proper divisors (3383178).

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

2215542 is a wasteful number, since it uses less digits than its factorization.

2215542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165.

The product of its digits is 800, while the sum is 21.

The square root of 2215542 is about 1488.4696839372. The cubic root of 2215542 is about 130.3646958638.

The spelling of 2215542 in words is "two million, two hundred fifteen thousand, five hundred forty-two".