1398308881 has 2 divisors, whose sum is σ = 1398308882. Its totient is φ = 1398308880.

The previous prime is 1398308839. The next prime is 1398308887. The reversal of 1398308881 is 1888038931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1183979281 + 214329600 = 34409^2 + 14640^2 .

It is a cyclic number.

It is not a de Polignac number, because 1398308881 - 2⁹ = 1398308369 is a prime.

It is a super-2 number, since 2×1398308881² = 3910535453366944322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1398308887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699154440 + 699154441.

It is an arithmetic number, because the mean of its divisors is an integer number (699154441).

Almost surely, 2^1398308881 is an apocalyptic number.

It is an amenable number.

1398308881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1398308881 is an equidigital number, since it uses as much as digits as its factorization.

1398308881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 331776, while the sum is 49.

The square root of 1398308881 is about 37393.9685109778. The cubic root of 1398308881 is about 1118.2383234196.

The spelling of 1398308881 in words is "one billion, three hundred ninety-eight million, three hundred eight thousand, eight hundred eighty-one".