1398392491 has 2 divisors, whose sum is σ = 1398392492. Its totient is φ = 1398392490.

The previous prime is 1398392459. The next prime is 1398392507. The reversal of 1398392491 is 1942938931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1398392491 - 2⁵ = 1398392459 is a prime.

It is not a weakly prime, because it can be changed into another prime (1398392591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699196245 + 699196246.

It is an arithmetic number, because the mean of its divisors is an integer number (699196246).

Almost surely, 2^1398392491 is an apocalyptic number.

1398392491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1398392491 is an equidigital number, since it uses as much as digits as its factorization.

1398392491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 419904, while the sum is 49.

The square root of 1398392491 is about 37395.0864553085. The cubic root of 1398392491 is about 1118.2606108279.

The spelling of 1398392491 in words is "one billion, three hundred ninety-eight million, three hundred ninety-two thousand, four hundred ninety-one".