1340803657 has 2 divisors, whose sum is σ = 1340803658. Its totient is φ = 1340803656.

The previous prime is 1340803637. The next prime is 1340803679. The reversal of 1340803657 is 7563080431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1045616896 + 295186761 = 32336^2 + 17181^2 .

It is a cyclic number.

It is not a de Polignac number, because 1340803657 - 2²⁷ = 1206585929 is a prime.

It is not a weakly prime, because it can be changed into another prime (1340803627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670401828 + 670401829.

It is an arithmetic number, because the mean of its divisors is an integer number (670401829).

Almost surely, 2^1340803657 is an apocalyptic number.

It is an amenable number.

1340803657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340803657 is an equidigital number, since it uses as much as digits as its factorization.

1340803657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 1340803657 is about 36616.9859081820. The cubic root of 1340803657 is about 1102.6941280906.

The spelling of 1340803657 in words is "one billion, three hundred forty million, eight hundred three thousand, six hundred fifty-seven".