1397871823 has 2 divisors, whose sum is σ = 1397871824. Its totient is φ = 1397871822.

The previous prime is 1397871773. The next prime is 1397871859. The reversal of 1397871823 is 3281787931.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1397871823 - 2²¹ = 1395774671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1397811823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 698935911 + 698935912.

It is an arithmetic number, because the mean of its divisors is an integer number (698935912).

Almost surely, 2^1397871823 is an apocalyptic number.

1397871823 is a deficient number, since it is larger than the sum of its proper divisors (1).

1397871823 is an equidigital number, since it uses as much as digits as its factorization.

1397871823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 49.

The square root of 1397871823 is about 37388.1240904114. The cubic root of 1397871823 is about 1118.1218050689.

The spelling of 1397871823 in words is "one billion, three hundred ninety-seven million, eight hundred seventy-one thousand, eight hundred twenty-three".