2152440 has 64 divisors (see below), whose sum is σ = 7178400. Its totient is φ = 573696.

The previous prime is 2152433. The next prime is 2152457. The reversal of 2152440 is 442512.

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 15 ways as a sum of consecutive naturals, for example, 84 + ... + 2076.

2^2152440 is an apocalyptic number.

2152440 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 2152440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3589200).

2152440 is an abundant number, since it is smaller than the sum of its proper divisors (5025960).

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

2152440 is a wasteful number, since it uses less digits than its factorization.

2152440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2013 (or 2003 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 2152440 is about 1467.1196270243. The cubic root of 2152440 is about 129.1150946852.

Adding to 2152440 its reverse (442512), we get a palindrome (2594952).

The spelling of 2152440 in words is "two million, one hundred fifty-two thousand, four hundred forty".