1390385 has 8 divisors (see below), whose sum is σ = 1674816. Its totient is φ = 1108080.

The previous prime is 1390369. The next prime is 1390387. The reversal of 1390385 is 5830931.

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

It is not a de Polignac number, because 1390385 - 2⁴ = 1390369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1390387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2150 + ... + 2720.

It is an arithmetic number, because the mean of its divisors is an integer number (209352).

2^1390385 is an apocalyptic number.

It is an amenable number.

1390385 is a deficient number, since it is larger than the sum of its proper divisors (284431).

1390385 is an equidigital number, since it uses as much as digits as its factorization.

1390385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 1390385 is about 1179.1458773197. The cubic root of 1390385 is about 111.6122058137.

The spelling of 1390385 in words is "one million, three hundred ninety thousand, three hundred eighty-five".