2140636440 has 32 divisors (see below), whose sum is σ = 6421909680. Its totient is φ = 570836352.

The previous prime is 2140636429. The next prime is 2140636441. The reversal of 2140636440 is 446360412.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 2140636398 and 2140636407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2140636441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8919199 + ... + 8919438.

Almost surely, 2^2140636440 is an apocalyptic number.

2140636440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2140636440 is an abundant number, since it is smaller than the sum of its proper divisors (4281273240).

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

2140636440 is a wasteful number, since it uses less digits than its factorization.

2140636440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17838651 (or 17838647 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 2140636440 is about 46267.0124386695. The cubic root of 2140636440 is about 1288.7864797194.

Adding to 2140636440 its reverse (446360412), we get a palindrome (2586996852).

The spelling of 2140636440 in words is "two billion, one hundred forty million, six hundred thirty-six thousand, four hundred forty".