1399266 has 48 divisors (see below), whose sum is σ = 3414528. Its totient is φ = 410400.

The previous prime is 1399261. The next prime is 1399271. The reversal of 1399266 is 6629931.

1399266 is a `hidden beast` number, since 1 + 399 + 266 = 666.

It is an interprime number because it is at equal distance from previous prime (1399261) and next prime (1399271).

It is a nude number because it is divisible by every one of its digits.

It is an Ulam number.

It is a nialpdrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 1399266.

It is not an unprimeable number, because it can be changed into a prime (1399261) 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 23 ways as a sum of consecutive naturals, for example, 7231 + ... + 7421.

It is an arithmetic number, because the mean of its divisors is an integer number (71136).

2^1399266 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1399266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1707264).

1399266 is an abundant number, since it is smaller than the sum of its proper divisors (2015262).

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

1399266 is a wasteful number, since it uses less digits than its factorization.

1399266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247 (or 244 counting only the distinct ones).

The product of its digits is 17496, while the sum is 36.

The square root of 1399266 is about 1182.9057443431. The cubic root of 1399266 is about 111.8493403694.

The spelling of 1399266 in words is "one million, three hundred ninety-nine thousand, two hundred sixty-six".