1340637019920 has 400 divisors, whose sum is σ = 5155356875328. Its totient is φ = 320150983680.

The previous prime is 1340637019919. The next prime is 1340637019921. The reversal of 1340637019920 is 299107360431.

1340637019920 is a `hidden beast` number, since 1 + 3 + 4 + 0 + 637 + 0 + 1 + 9 + 9 + 2 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (1340637019919) and next prime (1340637019921).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1340637019921) 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 79 ways as a sum of consecutive naturals, for example, 4635402 + ... + 4916118.

Almost surely, 2^{1340637019920} is an apocalyptic number.

1340637019920 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 1340637019920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2577678437664).

1340637019920 is an abundant number, since it is smaller than the sum of its proper divisors (3814719855408).

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

1340637019920 is a wasteful number, since it uses less digits than its factorization.

1340637019920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280820 (or 280805 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The spelling of 1340637019920 in words is "one trillion, three hundred forty billion, six hundred thirty-seven million, nineteen thousand, nine hundred twenty".