1399320 has 144 divisors (see below), whose sum is σ = 5138640. Its totient is φ = 329472.

The previous prime is 1399319. The next prime is 1399351. The reversal of 1399320 is 239931.

1399320 = T₃₁₅ + T₃₁₆ + ... + T₃₄₀.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 60829 + ... + 60851.

It is an arithmetic number, because the mean of its divisors is an integer number (35685).

2^1399320 is an apocalyptic number.

1399320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1399320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2569320).

1399320 is an abundant number, since it is smaller than the sum of its proper divisors (3739320).

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

1399320 is a wasteful number, since it uses less digits than its factorization.

1399320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66 (or 46 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 27.

The square root of 1399320 is about 1182.9285692720. The cubic root of 1399320 is about 111.8507791682.

The spelling of 1399320 in words is "one million, three hundred ninety-nine thousand, three hundred twenty".