1398209377723 has 2 divisors, whose sum is σ = 1398209377724. Its totient is φ = 1398209377722.

The previous prime is 1398209377673. The next prime is 1398209377739. The reversal of 1398209377723 is 3277739028931.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1398209377723 - 2⁹ = 1398209377211 is a prime.

It is not a weakly prime, because it can be changed into another prime (1398209377793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699104688861 + 699104688862.

It is an arithmetic number, because the mean of its divisors is an integer number (699104688862).

Almost surely, 2^{1398209377723} is an apocalyptic number.

1398209377723 is a deficient number, since it is larger than the sum of its proper divisors (1).

1398209377723 is an equidigital number, since it uses as much as digits as its factorization.

1398209377723 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24004512, while the sum is 61.

The spelling of 1398209377723 in words is "one trillion, three hundred ninety-eight billion, two hundred nine million, three hundred seventy-seven thousand, seven hundred twenty-three".