1390066 has 8 divisors (see below), whose sum is σ = 2113884. Its totient is φ = 685440.

The previous prime is 1390043. The next prime is 1390069. The reversal of 1390066 is 6600931.

It can be written as a sum of positive squares in 2 ways, for example, as 1390041 + 25 = 1179^2 + 5^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 1390066.

It is not an unprimeable number, because it can be changed into a prime (1390069) 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, 4615 + ... + 4906.

2^1390066 is an apocalyptic number.

1390066 is a deficient number, since it is larger than the sum of its proper divisors (723818).

1390066 is an equidigital number, since it uses as much as digits as its factorization.

1390066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9596.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 1390066 is about 1179.0106021576. The cubic root of 1390066 is about 111.6036693252.

Subtracting from 1390066 its sum of digits (25), we obtain a square (1390041 = 1179²).

Adding to 1390066 its reverse (6600931), we get a palindrome (7990997).

The spelling of 1390066 in words is "one million, three hundred ninety thousand, sixty-six".