1397765827 has 2 divisors, whose sum is σ = 1397765828. Its totient is φ = 1397765826.

The previous prime is 1397765813. The next prime is 1397765833. The reversal of 1397765827 is 7285677931.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1397765827 is a prime.

It is not a weakly prime, because it can be changed into another prime (1397765627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 698882913 + 698882914.

It is an arithmetic number, because the mean of its divisors is an integer number (698882914).

Almost surely, 2^1397765827 is an apocalyptic number.

1397765827 is a deficient number, since it is larger than the sum of its proper divisors (1).

1397765827 is an equidigital number, since it uses as much as digits as its factorization.

1397765827 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4445280, while the sum is 55.

The square root of 1397765827 is about 37386.7065546031. The cubic root of 1397765827 is about 1118.0935431942.

The spelling of 1397765827 in words is "one billion, three hundred ninety-seven million, seven hundred sixty-five thousand, eight hundred twenty-seven".