1899999 has 12 divisors (see below), whose sum is σ = 2771496. Its totient is φ = 1254192.

The previous prime is 1899983. The next prime is 1900009. The reversal of 1899999 is 9999981.

It is not a de Polignac number, because 1899999 - 2⁴ = 1899983 is a prime.

1899999 is a modest number, since divided by 9999 gives 189 as remainder.

1899999 is a lucky number.

It is a plaindrome in base 10.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1899929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24 + ... + 1949.

It is an arithmetic number, because the mean of its divisors is an integer number (230958).

2^1899999 is an apocalyptic number.

1899999 is a deficient number, since it is larger than the sum of its proper divisors (871497).

1899999 is a wasteful number, since it uses less digits than its factorization.

1899999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2086 (or 2083 counting only the distinct ones).

The product of its digits is 472392, while the sum is 54.

The square root of 1899999 is about 1378.4045124708. The cubic root of 1899999 is about 123.8562112338.

The spelling of 1899999 in words is "one million, eight hundred ninety-nine thousand, nine hundred ninety-nine".