1340243397 has 6 divisors (see below), whose sum is σ = 1935907142. Its totient is φ = 893495592.

The previous prime is 1340243353. The next prime is 1340243417. The reversal of 1340243397 is 7933420431.

1340243397 is a `hidden beast` number, since 134 + 0 + 2 + 433 + 97 = 666.

It can be written as a sum of positive squares in only one way, i.e., 783944001 + 556299396 = 27999^2 + 23586^2 .

It is not a de Polignac number, because 1340243397 - 2²⁰ = 1339194821 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 (1340244397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 74457958 + ... + 74457975.

Almost surely, 2^1340243397 is an apocalyptic number.

It is an amenable number.

1340243397 is a deficient number, since it is larger than the sum of its proper divisors (595663745).

1340243397 is a wasteful number, since it uses less digits than its factorization.

1340243397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148915939 (or 148915936 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 36.

The square root of 1340243397 is about 36609.3348341649. The cubic root of 1340243397 is about 1102.5405183560.

The spelling of 1340243397 in words is "one billion, three hundred forty million, two hundred forty-three thousand, three hundred ninety-seven".