1340212397 has 2 divisors, whose sum is σ = 1340212398. Its totient is φ = 1340212396.

The previous prime is 1340212381. The next prime is 1340212403. The reversal of 1340212397 is 7932120431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 990297961 + 349914436 = 31469^2 + 18706^2 .

It is a cyclic number.

It is not a de Polignac number, because 1340212397 - 2⁴ = 1340212381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1340212297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670106198 + 670106199.

It is an arithmetic number, because the mean of its divisors is an integer number (670106199).

Almost surely, 2^1340212397 is an apocalyptic number.

It is an amenable number.

1340212397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340212397 is an equidigital number, since it uses as much as digits as its factorization.

1340212397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 1340212397 is about 36608.9114424343. The cubic root of 1340212397 is about 1102.5320176564.

The spelling of 1340212397 in words is "one billion, three hundred forty million, two hundred twelve thousand, three hundred ninety-seven".