1390817 has 4 divisors (see below), whose sum is σ = 1396116. Its totient is φ = 1385520.

The previous prime is 1390813. The next prime is 1390841. The reversal of 1390817 is 7180931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 776161 + 614656 = 881^2 + 784^2 .

It is a cyclic number.

It is not a de Polignac number, because 1390817 - 2² = 1390813 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 1390817.

It is not an unprimeable number, because it can be changed into a prime (1390813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2234 + ... + 2787.

It is an arithmetic number, because the mean of its divisors is an integer number (349029).

2^1390817 is an apocalyptic number.

It is an amenable number.

1390817 is a deficient number, since it is larger than the sum of its proper divisors (5299).

1390817 is an equidigital number, since it uses as much as digits as its factorization.

1390817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5298.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 1390817 is about 1179.3290465345. The cubic root of 1390817 is about 111.6237641184.

The spelling of 1390817 in words is "one million, three hundred ninety thousand, eight hundred seventeen".