1438866 has 72 divisors (see below), whose sum is σ = 3768336. Its totient is φ = 393120.

The previous prime is 1438849. The next prime is 1438867. The reversal of 1438866 is 6688341.

It is a happy number.

Its product of digits (27648) is a multiple of the sum of its prime divisors (72).

It is a self number, because there is not a number n which added to its sum of digits gives 1438866.

It is not an unprimeable number, because it can be changed into a prime (1438867) 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 35 ways as a sum of consecutive naturals, for example, 33441 + ... + 33483.

It is an arithmetic number, because the mean of its divisors is an integer number (52338).

2^1438866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1438866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1884168).

1438866 is an abundant number, since it is smaller than the sum of its proper divisors (2329470).

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

1438866 is a wasteful number, since it uses less digits than its factorization.

1438866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88 (or 72 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 1438866 is about 1199.5274069399. The cubic root of 1438866 is about 112.8946730462.

It can be divided in two parts, 1438 and 866, that added together give a square (2304 = 48²).

The spelling of 1438866 in words is "one million, four hundred thirty-eight thousand, eight hundred sixty-six".