1397873849 has 2 divisors, whose sum is σ = 1397873850. Its totient is φ = 1397873848.

The previous prime is 1397873837. The next prime is 1397873881. The reversal of 1397873849 is 9483787931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1388903824 + 8970025 = 37268^2 + 2995^2 .

It is a cyclic number.

It is not a de Polignac number, because 1397873849 - 2⁸ = 1397873593 is a prime.

It is not a weakly prime, because it can be changed into another prime (1397873899) 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, 698936924 + 698936925.

It is an arithmetic number, because the mean of its divisors is an integer number (698936925).

Almost surely, 2^1397873849 is an apocalyptic number.

It is an amenable number.

1397873849 is a deficient number, since it is larger than the sum of its proper divisors (1).

1397873849 is an equidigital number, since it uses as much as digits as its factorization.

1397873849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9144576, while the sum is 59.

The square root of 1397873849 is about 37388.1511845665. The cubic root of 1397873849 is about 1118.1223452504.

The spelling of 1397873849 in words is "one billion, three hundred ninety-seven million, eight hundred seventy-three thousand, eight hundred forty-nine".