1397274643 has 2 divisors, whose sum is σ = 1397274644. Its totient is φ = 1397274642.

The previous prime is 1397274617. The next prime is 1397274661. The reversal of 1397274643 is 3464727931.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1397274643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1397274593 and 1397274602.

It is not a weakly prime, because it can be changed into another prime (1397274943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 698637321 + 698637322.

It is an arithmetic number, because the mean of its divisors is an integer number (698637322).

Almost surely, 2^1397274643 is an apocalyptic number.

1397274643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1397274643 is an equidigital number, since it uses as much as digits as its factorization.

1397274643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 46.

The square root of 1397274643 is about 37380.1370115199. The cubic root of 1397274643 is about 1117.9625594032.

The spelling of 1397274643 in words is "one billion, three hundred ninety-seven million, two hundred seventy-four thousand, six hundred forty-three".