1999956 has 48 divisors (see below), whose sum is σ = 5523840. Its totient is φ = 551040.

The previous prime is 1999891. The next prime is 1999957. The reversal of 1999956 is 6599991.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999957) 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, 2026 + ... + 2846.

It is an arithmetic number, because the mean of its divisors is an integer number (115080).

2^1999956 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1999956, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2761920).

1999956 is an abundant number, since it is smaller than the sum of its proper divisors (3523884).

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

1999956 is a wasteful number, since it uses less digits than its factorization.

1999956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864 (or 862 counting only the distinct ones).

The product of its digits is 196830, while the sum is 48.

The square root of 1999956 is about 1414.1980059383. The cubic root of 1999956 is about 125.9911810406.

The spelling of 1999956 in words is "one million, nine hundred ninety-nine thousand, nine hundred fifty-six".