2143402440 has 32 divisors (see below), whose sum is σ = 6430207680. Its totient is φ = 571573952.

The previous prime is 2143402423. The next prime is 2143402447. The reversal of 2143402440 is 442043412.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 2143402440.

It is not an unprimeable number, because it can be changed into a prime (2143402447) 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, 8930724 + ... + 8930963.

It is an arithmetic number, because the mean of its divisors is an integer number (200943990).

Almost surely, 2^2143402440 is an apocalyptic number.

2143402440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2143402440 is an abundant number, since it is smaller than the sum of its proper divisors (4286805240).

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

2143402440 is a wasteful number, since it uses less digits than its factorization.

2143402440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17861701 (or 17861697 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 2143402440 is about 46296.8944962834. The cubic root of 2143402440 is about 1289.3413379287.

Adding to 2143402440 its reverse (442043412), we get a palindrome (2585445852).

The spelling of 2143402440 in words is "two billion, one hundred forty-three million, four hundred two thousand, four hundred forty".