1340668821 has 8 divisors (see below), whose sum is σ = 1795365280. Its totient is φ = 889875792.

The previous prime is 1340668817. The next prime is 1340668883. The reversal of 1340668821 is 1288660431.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1340668821 - 2² = 1340668817 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1340668821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340668801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 975055 + ... + 976428.

It is an arithmetic number, because the mean of its divisors is an integer number (224420660).

Almost surely, 2^1340668821 is an apocalyptic number.

It is an amenable number.

1340668821 is a deficient number, since it is larger than the sum of its proper divisors (454696459).

1340668821 is a wasteful number, since it uses less digits than its factorization.

1340668821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1951715.

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 1340668821 is about 36615.1446945113. The cubic root of 1340668821 is about 1102.6571632327.

The spelling of 1340668821 in words is "one billion, three hundred forty million, six hundred sixty-eight thousand, eight hundred twenty-one".