1340287440 has 80 divisors (see below), whose sum is σ = 4185321408. Its totient is φ = 354792448.

The previous prime is 1340287439. The next prime is 1340287451. The reversal of 1340287440 is 447820431.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

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, 12499 + ... + 53261.

Almost surely, 2^1340287440 is an apocalyptic number.

1340287440 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 1340287440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2092660704).

1340287440 is an abundant number, since it is smaller than the sum of its proper divisors (2845033968).

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

1340287440 is a wasteful number, since it uses less digits than its factorization.

1340287440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40916 (or 40910 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 33.

The square root of 1340287440 is about 36609.9363561315. The cubic root of 1340287440 is about 1102.5525954310.

The spelling of 1340287440 in words is "one billion, three hundred forty million, two hundred eighty-seven thousand, four hundred forty".