2015550 has 48 divisors (see below), whose sum is σ = 5557680. Its totient is φ = 537120.

The previous prime is 2015543. The next prime is 2015557. The reversal of 2015550 is 555102.

It is an interprime number because it is at equal distance from previous prime (2015543) and next prime (2015557).

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2015557) 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, 604 + ... + 2096.

It is an arithmetic number, because the mean of its divisors is an integer number (115785).

2^2015550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2015550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2778840).

2015550 is an abundant number, since it is smaller than the sum of its proper divisors (3542130).

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

2015550 is a wasteful number, since it uses less digits than its factorization.

2015550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1514 (or 1503 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 18.

The square root of 2015550 is about 1419.7006726772. The cubic root of 2015550 is about 126.3177919090.

The spelling of 2015550 in words is "two million, fifteen thousand, five hundred fifty".