1898989 has 4 divisors (see below), whose sum is σ = 1901824. Its totient is φ = 1896156.

The previous prime is 1898983. The next prime is 1899017. The reversal of 1898989 is 9898981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1898989 - 2⁷ = 1898861 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1898983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214 + ... + 1960.

It is an arithmetic number, because the mean of its divisors is an integer number (475456).

2^1898989 is an apocalyptic number.

It is an amenable number.

1898989 is a deficient number, since it is larger than the sum of its proper divisors (2835).

1898989 is a wasteful number, since it uses less digits than its factorization.

1898989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2834.

The product of its digits is 373248, while the sum is 52.

The square root of 1898989 is about 1378.0380981671. The cubic root of 1898989 is about 123.8342608809.

The spelling of 1898989 in words is "one million, eight hundred ninety-eight thousand, nine hundred eighty-nine".