1999925 has 6 divisors (see below), whose sum is σ = 2479938.
Its totient is φ = 1599920.
The previous prime is 1999891. The next prime is 1999957. The reversal of 1999925 is 5299991.
It can be written as a sum of positive squares in 3 ways, for example, as 529 + 1999396 = 23^2 + 1414^2
It is not a de Polignac number, because 1999925 - 216 = 1934389 is a prime.
It is an Ulam number.
It is a Duffinian number.
It is a Curzon number.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 39974 + ... + 40023.
It is an arithmetic number, because the mean of its divisors is an integer number (413323).
21999925 is an apocalyptic number.
It is an amenable number.
1999925 is a deficient number, since it is larger than the sum of its proper divisors (480013).
1999925 is an equidigital number, since it uses as much as digits as its factorization.
1999925 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 80007 (or 80002 counting only the distinct ones).
The product of its digits is 65610, while the sum is 44.
The square root of 1999925 is about 1414.1870456202.
The cubic root of 1999925 is about 125.9905300685.
The spelling of 1999925 in words is "one million, nine hundred ninety-nine thousand, nine hundred twenty-five".