1340342621 has 4 divisors (see below), whose sum is σ = 1341570012. Its totient is φ = 1339115232.

The previous prime is 1340342617. The next prime is 1340342623. The reversal of 1340342621 is 1262430431.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1295640025 + 44702596 = 35995^2 + 6686^2 .

It is a cyclic number.

It is not a de Polignac number, because 1340342621 - 2² = 1340342617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340342623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 612056 + ... + 614241.

It is an arithmetic number, because the mean of its divisors is an integer number (335392503).

Almost surely, 2^1340342621 is an apocalyptic number.

It is an amenable number.

1340342621 is a deficient number, since it is larger than the sum of its proper divisors (1227391).

1340342621 is a wasteful number, since it uses less digits than its factorization.

1340342621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1227390.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 1340342621 is about 36610.6899825720. The cubic root of 1340342621 is about 1102.5677262948.

The spelling of 1340342621 in words is "one billion, three hundred forty million, three hundred forty-two thousand, six hundred twenty-one".