1397964671 has 2 divisors, whose sum is σ = 1397964672. Its totient is φ = 1397964670.

The previous prime is 1397964661. The next prime is 1397964677. The reversal of 1397964671 is 1764697931.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1397964671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1397964677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 698982335 + 698982336.

It is an arithmetic number, because the mean of its divisors is an integer number (698982336).

Almost surely, 2^1397964671 is an apocalyptic number.

1397964671 is a deficient number, since it is larger than the sum of its proper divisors (1).

1397964671 is an equidigital number, since it uses as much as digits as its factorization.

1397964671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1714608, while the sum is 53.

The square root of 1397964671 is about 37389.3657474956. The cubic root of 1397964671 is about 1118.1465600984.

The spelling of 1397964671 in words is "one billion, three hundred ninety-seven million, nine hundred sixty-four thousand, six hundred seventy-one".