1399278 has 16 divisors (see below), whose sum is σ = 2889216. Its totient is φ = 451320.

The previous prime is 1399273. The next prime is 1399283. The reversal of 1399278 is 8729931.

It is an interprime number because it is at equal distance from previous prime (1399273) and next prime (1399283).

It is a plaindrome in base 16.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3576 + ... + 3947.

It is an arithmetic number, because the mean of its divisors is an integer number (180576).

2^1399278 is an apocalyptic number.

1399278 is an abundant number, since it is smaller than the sum of its proper divisors (1489938).

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

1399278 is a wasteful number, since it uses less digits than its factorization.

1399278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7559.

The product of its digits is 27216, while the sum is 39.

The square root of 1399278 is about 1182.9108165876. The cubic root of 1399278 is about 111.8496601057.

The spelling of 1399278 in words is "one million, three hundred ninety-nine thousand, two hundred seventy-eight".