1999560 has 64 divisors (see below), whose sum is σ = 6321600. Its totient is φ = 504576.

The previous prime is 1999559. The next prime is 1999561. The reversal of 1999560 is 659991.

It is an interprime number because it is at equal distance from previous prime (1999559) and next prime (1999561).

It is not an unprimeable number, because it can be changed into a prime (1999561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1842 + ... + 2718.

It is an arithmetic number, because the mean of its divisors is an integer number (98775).

2^1999560 is an apocalyptic number.

1999560 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 1999560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3160800).

1999560 is an abundant number, since it is smaller than the sum of its proper divisors (4322040).

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

1999560 is a wasteful number, since it uses less digits than its factorization.

1999560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910 (or 906 counting only the distinct ones).

The product of its (nonzero) digits is 21870, while the sum is 39.

The square root of 1999560 is about 1414.0579903243. The cubic root of 1999560 is about 125.9828648908.

The spelling of 1999560 in words is "one million, nine hundred ninety-nine thousand, five hundred sixty".