1289998 has 4 divisors (see below), whose sum is σ = 1935000. Its totient is φ = 644998.

The previous prime is 1289971. The next prime is 1290013. The reversal of 1289998 is 8999821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8999821 = 1303 ⋅6907.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322498 + ... + 322501.

It is an arithmetic number, because the mean of its divisors is an integer number (483750).

2^1289998 is an apocalyptic number.

1289998 is a deficient number, since it is larger than the sum of its proper divisors (645002).

1289998 is an equidigital number, since it uses as much as digits as its factorization.

1289998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645001.

The product of its digits is 93312, while the sum is 46.

The square root of 1289998 is about 1135.7807887088. The cubic root of 1289998 is about 108.8586670875.

The spelling of 1289998 in words is "one million, two hundred eighty-nine thousand, nine hundred ninety-eight".