1399280 has 20 divisors (see below), whose sum is σ = 3253512. Its totient is φ = 559680.

The previous prime is 1399273. The next prime is 1399283. The reversal of 1399280 is 829931.

It is a tau number, because it is divible by the number of its divisors (20).

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 (1399283) 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 3 ways as a sum of consecutive naturals, for example, 8666 + ... + 8825.

2^1399280 is an apocalyptic number.

1399280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1399280 is an abundant number, since it is smaller than the sum of its proper divisors (1854232).

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

1399280 is a wasteful number, since it uses less digits than its factorization.

1399280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17504 (or 17498 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 1399280 is about 1182.9116619596. The cubic root of 1399280 is about 111.8497133949.

The spelling of 1399280 in words is "one million, three hundred ninety-nine thousand, two hundred eighty".