1398481265 has 8 divisors (see below), whose sum is σ = 1679966568. Its totient is φ = 1117592320.

The previous prime is 1398481241. The next prime is 1398481309. The reversal of 1398481265 is 5621848931.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20449 + 1398460816 = 143^2 + 37396^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1398481265 - 2¹² = 1398477169 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143912 + ... + 153321.

It is an arithmetic number, because the mean of its divisors is an integer number (209995821).

Almost surely, 2^1398481265 is an apocalyptic number.

It is an amenable number.

1398481265 is a deficient number, since it is larger than the sum of its proper divisors (281485303).

1398481265 is an equidigital number, since it uses as much as digits as its factorization.

1398481265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298179.

The product of its digits is 414720, while the sum is 47.

The square root of 1398481265 is about 37396.2734105953. The cubic root of 1398481265 is about 1118.2842737998.

The spelling of 1398481265 in words is "one billion, three hundred ninety-eight million, four hundred eighty-one thousand, two hundred sixty-five".