2421240 has 32 divisors (see below), whose sum is σ = 7264080. Its totient is φ = 645632.

The previous prime is 2421229. The next prime is 2421247. The reversal of 2421240 is 421242.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2421247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9969 + ... + 10208.

2^2421240 is an apocalyptic number.

2421240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2421240 is an abundant number, since it is smaller than the sum of its proper divisors (4842840).

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

2421240 is a wasteful number, since it uses less digits than its factorization.

2421240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20191 (or 20187 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 2421240 is about 1556.0334186643. The cubic root of 2421240 is about 134.2803960040.

Adding to 2421240 its reverse (421242), we get a palindrome (2842482).

The spelling of 2421240 in words is "two million, four hundred twenty-one thousand, two hundred forty".