2143240 has 32 divisors (see below), whose sum is σ = 5261760. Its totient is φ = 779200.

The previous prime is 2143231. The next prime is 2143243. The reversal of 2143240 is 423412.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2143243) 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, 1996 + ... + 2875.

It is an arithmetic number, because the mean of its divisors is an integer number (164430).

2^2143240 is an apocalyptic number.

2143240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2143240 is an abundant number, since it is smaller than the sum of its proper divisors (3118520).

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

2143240 is a wasteful number, since it uses less digits than its factorization.

2143240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4893 (or 4889 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 2143240 is about 1463.9808741920. The cubic root of 2143240 is about 128.9308765744.

Adding to 2143240 its reverse (423412), we get a palindrome (2566652).

The spelling of 2143240 in words is "two million, one hundred forty-three thousand, two hundred forty".