1390563809 has 8 divisors (see below), whose sum is σ = 1417438440. Its totient is φ = 1363712896.

The previous prime is 1390563791. The next prime is 1390563817. The reversal of 1390563809 is 9083650931.

It can be written as a sum of positive squares in 4 ways, for example, as 361950625 + 1028613184 = 19025^2 + 32072^2 .

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

It is not a de Polignac number, because 1390563809 - 2²⁰ = 1389515233 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1390563809.

It is not an unprimeable number, because it can be changed into a prime (1390563829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152939 + ... + 161775.

It is an arithmetic number, because the mean of its divisors is an integer number (177179805).

Almost surely, 2^1390563809 is an apocalyptic number.

It is an amenable number.

1390563809 is a deficient number, since it is larger than the sum of its proper divisors (26874631).

1390563809 is an equidigital number, since it uses as much as digits as its factorization.

1390563809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11859.

The product of its (nonzero) digits is 174960, while the sum is 44.

The square root of 1390563809 is about 37290.2642656230. The cubic root of 1390563809 is about 1116.1699019876.

The spelling of 1390563809 in words is "one billion, three hundred ninety million, five hundred sixty-three thousand, eight hundred nine".