1340442240 has 128 divisors (see below), whose sum is σ = 4345444800. Its totient is φ = 351363072.

The previous prime is 1340442227. The next prime is 1340442269. The reversal of 1340442240 is 422440431.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

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 1340442240.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107364 + ... + 119196.

Almost surely, 2^1340442240 is an apocalyptic number.

1340442240 is a gapful number since it is divisible by the number (10) 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 1340442240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2172722400).

1340442240 is an abundant number, since it is smaller than the sum of its proper divisors (3005002560).

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

1340442240 is a wasteful number, since it uses less digits than its factorization.

1340442240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11914 (or 11902 counting only the distinct ones).

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

The square root of 1340442240 is about 36612.0504752192. The cubic root of 1340442240 is about 1102.5950411946.

Adding to 1340442240 its reverse (422440431), we get a palindrome (1762882671).

The spelling of 1340442240 in words is "one billion, three hundred forty million, four hundred forty-two thousand, two hundred forty".