1390668 has 36 divisors (see below), whose sum is σ = 3455592. Its totient is φ = 435200.

The previous prime is 1390643. The next prime is 1390681. The reversal of 1390668 is 8660931.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3268 + ... + 3668.

2^1390668 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1390668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1727796).

1390668 is an abundant number, since it is smaller than the sum of its proper divisors (2064924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1390668 is a wasteful number, since it uses less digits than its factorization.

1390668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442 (or 423 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 1390668 is about 1179.2658733297. The cubic root of 1390668 is about 111.6197778439.

The spelling of 1390668 in words is "one million, three hundred ninety thousand, six hundred sixty-eight".