1998626 has 8 divisors (see below), whose sum is σ = 3426240. Its totient is φ = 856548.

The previous prime is 1998617. The next prime is 1998637. The reversal of 1998626 is 6268991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71366 + ... + 71393.

It is an arithmetic number, because the mean of its divisors is an integer number (428280).

2^1998626 is an apocalyptic number.

1998626 is a deficient number, since it is larger than the sum of its proper divisors (1427614).

1998626 is a wasteful number, since it uses less digits than its factorization.

1998626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142768.

The product of its digits is 46656, while the sum is 41.

The square root of 1998626 is about 1413.7276965526. The cubic root of 1998626 is about 125.9632461878.

The spelling of 1998626 in words is "one million, nine hundred ninety-eight thousand, six hundred twenty-six".