1340355666 has 64 divisors (see below), whose sum is σ = 2976640128. Its totient is φ = 399748608.

The previous prime is 1340355647. The next prime is 1340355671. The reversal of 1340355666 is 6665530431.

It is a happy number.

It is a super-2 number, since 2×1340355666² = 3593106622756607112, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 458040 + ... + 460956.

It is an arithmetic number, because the mean of its divisors is an integer number (46510002).

Almost surely, 2^1340355666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1340355666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1488320064).

1340355666 is an abundant number, since it is smaller than the sum of its proper divisors (1636284462).

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

1340355666 is a wasteful number, since it uses less digits than its factorization.

1340355666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3115.

The product of its (nonzero) digits is 194400, while the sum is 39.

The square root of 1340355666 is about 36610.8681404853. The cubic root of 1340355666 is about 1102.5713032283.

The spelling of 1340355666 in words is "one billion, three hundred forty million, three hundred fifty-five thousand, six hundred sixty-six".