1340719697 has 4 divisors (see below), whose sum is σ = 1369245696. Its totient is φ = 1312193700.

The previous prime is 1340719693. The next prime is 1340719727. The reversal of 1340719697 is 7969170431.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7969170431 = 3923 ⋅2031397.

It is a cyclic number.

It is not a de Polignac number, because 1340719697 - 2² = 1340719693 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 28525951 = 1340719697 / (1 + 3 + 4 + 0 + 7 + 1 + 9 + 6 + 9 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1340719693) 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, 14262929 + ... + 14263022.

It is an arithmetic number, because the mean of its divisors is an integer number (342311424).

Almost surely, 2^1340719697 is an apocalyptic number.

It is an amenable number.

1340719697 is a deficient number, since it is larger than the sum of its proper divisors (28525999).

1340719697 is an equidigital number, since it uses as much as digits as its factorization.

1340719697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28525998.

The product of its (nonzero) digits is 285768, while the sum is 47.

The square root of 1340719697 is about 36615.8394277668. The cubic root of 1340719697 is about 1102.6711110164.

The spelling of 1340719697 in words is "one billion, three hundred forty million, seven hundred nineteen thousand, six hundred ninety-seven".