1398823831 has 2 divisors, whose sum is σ = 1398823832. Its totient is φ = 1398823830.

The previous prime is 1398823717. The next prime is 1398823873. The reversal of 1398823831 is 1383288931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1398823831 - 2¹⁹ = 1398299543 is a prime.

It is a super-2 number, since 2×1398823831² = 3913416220347033122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1398823031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699411915 + 699411916.

It is an arithmetic number, because the mean of its divisors is an integer number (699411916).

Almost surely, 2^1398823831 is an apocalyptic number.

1398823831 is a deficient number, since it is larger than the sum of its proper divisors (1).

1398823831 is an equidigital number, since it uses as much as digits as its factorization.

1398823831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 46.

The square root of 1398823831 is about 37400.8533458797. The cubic root of 1398823831 is about 1118.3755763923.

The spelling of 1398823831 in words is "one billion, three hundred ninety-eight million, eight hundred twenty-three thousand, eight hundred thirty-one".