1398239923 has 2 divisors, whose sum is σ = 1398239924. Its totient is φ = 1398239922.

The previous prime is 1398239893. The next prime is 1398239939. The reversal of 1398239923 is 3299328931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1398239923 - 2¹⁷ = 1398108851 is a prime.

It is not a weakly prime, because it can be changed into another prime (1398239123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699119961 + 699119962.

It is an arithmetic number, because the mean of its divisors is an integer number (699119962).

Almost surely, 2^1398239923 is an apocalyptic number.

1398239923 is a deficient number, since it is larger than the sum of its proper divisors (1).

1398239923 is an equidigital number, since it uses as much as digits as its factorization.

1398239923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 629856, while the sum is 49.

The square root of 1398239923 is about 37393.0464525157. The cubic root of 1398239923 is about 1118.2199410372.

The spelling of 1398239923 in words is "one billion, three hundred ninety-eight million, two hundred thirty-nine thousand, nine hundred twenty-three".