1999898 has 16 divisors (see below), whose sum is σ = 3182760. Its totient is φ = 941920.

The previous prime is 1999891. The next prime is 1999957. The reversal of 1999898 is 8989991.

It can be written as a sum of positive squares in 4 ways, for example, as 528529 + 1471369 = 727^2 + 1213^2 .

It is an Ulam number.

Its product of digits (419904) is a multiple of the sum of its prime divisors (72).

It is not an unprimeable number, because it can be changed into a prime (1999891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48758 + ... + 48798.

2^1999898 is an apocalyptic number.

1999898 is a deficient number, since it is larger than the sum of its proper divisors (1182862).

1999898 is an frugal number, since it uses more digits than its factorization.

1999898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130 (or 72 counting only the distinct ones).

The product of its digits is 419904, while the sum is 53.

The square root of 1999898 is about 1414.1774994674. The cubic root of 1999898 is about 125.9899630873.

The spelling of 1999898 in words is "one million, nine hundred ninety-nine thousand, eight hundred ninety-eight".