1398759931 has 2 divisors, whose sum is σ = 1398759932. Its totient is φ = 1398759930.

The previous prime is 1398759913. The next prime is 1398759937. The reversal of 1398759931 is 1399578931.

Together with previous prime (1398759913) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1398759931 - 2²¹ = 1396662779 is a prime.

It is a super-2 number, since 2×1398759931² = 3913058689142249522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1398759937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699379965 + 699379966.

It is an arithmetic number, because the mean of its divisors is an integer number (699379966).

Almost surely, 2^1398759931 is an apocalyptic number.

1398759931 is a deficient number, since it is larger than the sum of its proper divisors (1).

1398759931 is an equidigital number, since it uses as much as digits as its factorization.

1398759931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1837080, while the sum is 55.

The square root of 1398759931 is about 37399.9990775401. Note that the first 3 decimals coincide. The cubic root of 1398759931 is about 1118.3585465405.

The spelling of 1398759931 in words is "one billion, three hundred ninety-eight million, seven hundred fifty-nine thousand, nine hundred thirty-one".