1399120 has 20 divisors (see below), whose sum is σ = 3253140. Its totient is φ = 559616.

The previous prime is 1399109. The next prime is 1399121. The reversal of 1399120 is 219931.

1399120 = 70² + 71² + ... + 165².

It can be written as a sum of positive squares in 2 ways, for example, as 153664 + 1245456 = 392^2 + 1116^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8665 + ... + 8824.

It is an arithmetic number, because the mean of its divisors is an integer number (162657).

2^1399120 is an apocalyptic number.

1399120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1399120 is an abundant number, since it is smaller than the sum of its proper divisors (1854020).

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

1399120 is a wasteful number, since it uses less digits than its factorization.

1399120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17502 (or 17496 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 1399120 is about 1182.8440302931. The cubic root of 1399120 is about 111.8454500985.

The spelling of 1399120 in words is "one million, three hundred ninety-nine thousand, one hundred twenty".