1398027971 has 2 divisors, whose sum is σ = 1398027972. Its totient is φ = 1398027970.

The previous prime is 1398027949. The next prime is 1398027973. The reversal of 1398027971 is 1797208931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1398027971 - 2¹⁸ = 1397765827 is a prime.

Together with 1398027973, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1398027973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699013985 + 699013986.

It is an arithmetic number, because the mean of its divisors is an integer number (699013986).

Almost surely, 2^1398027971 is an apocalyptic number.

1398027971 is a deficient number, since it is larger than the sum of its proper divisors (1).

1398027971 is an equidigital number, since it uses as much as digits as its factorization.

1398027971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 190512, while the sum is 47.

The square root of 1398027971 is about 37390.2122352896. The cubic root of 1398027971 is about 1118.1634364450.

The spelling of 1398027971 in words is "one billion, three hundred ninety-eight million, twenty-seven thousand, nine hundred seventy-one".