2421540 has 72 divisors (see below), whose sum is σ = 8019648. Its totient is φ = 586560.

The previous prime is 2421533. The next prime is 2421541. The reversal of 2421540 is 451242.

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

It is not an unprimeable number, because it can be changed into a prime (2421541) 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, 1369 + ... + 2591.

It is an arithmetic number, because the mean of its divisors is an integer number (111384).

2^2421540 is an apocalyptic number.

2421540 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 2421540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4009824).

2421540 is an abundant number, since it is smaller than the sum of its proper divisors (5598108).

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

2421540 is a wasteful number, since it uses less digits than its factorization.

2421540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1249 (or 1244 counting only the distinct ones).

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

The square root of 2421540 is about 1556.1298146363. The cubic root of 2421540 is about 134.2859417099.

Adding to 2421540 its reverse (451242), we get a palindrome (2872782).

The spelling of 2421540 in words is "two million, four hundred twenty-one thousand, five hundred forty".