1390866 has 16 divisors (see below), whose sum is σ = 2829600. Its totient is φ = 455648.

The previous prime is 1390859. The next prime is 1390891. The reversal of 1390866 is 6680931.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1611 + ... + 2318.

It is an arithmetic number, because the mean of its divisors is an integer number (176850).

2^1390866 is an apocalyptic number.

1390866 is an abundant number, since it is smaller than the sum of its proper divisors (1438734).

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

1390866 is a wasteful number, since it uses less digits than its factorization.

1390866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3993.

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

The square root of 1390866 is about 1179.3498208759. The cubic root of 1390866 is about 111.6250749786.

The spelling of 1390866 in words is "one million, three hundred ninety thousand, eight hundred sixty-six".