1340666880 has 352 divisors, whose sum is σ = 5048000256. Its totient is φ = 297271296.

The previous prime is 1340666867. The next prime is 1340666881. The reversal of 1340666880 is 886660431.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340666881) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3978072 + ... + 3978408.

Almost surely, 2^1340666880 is an apocalyptic number.

1340666880 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 1340666880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2524000128).

1340666880 is an abundant number, since it is smaller than the sum of its proper divisors (3707333376).

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

1340666880 is a wasteful number, since it uses less digits than its factorization.

1340666880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409 (or 391 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 1340666880 is about 36615.1181890759. The cubic root of 1340666880 is about 1102.6566310957.

The spelling of 1340666880 in words is "one billion, three hundred forty million, six hundred sixty-six thousand, eight hundred eighty".