998621 has 12 divisors (see below), whose sum is σ = 1141920. Its totient is φ = 870480.

The previous prime is 998617. The next prime is 998623. The reversal of 998621 is 126899.

It is not a de Polignac number, because 998621 - 2² = 998617 is a prime.

It is a Curzon number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998623) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3056 + ... + 3366.

It is an arithmetic number, because the mean of its divisors is an integer number (95160).

2⁹⁹⁸⁶²¹ is an apocalyptic number.

It is an amenable number.

998621 is a deficient number, since it is larger than the sum of its proper divisors (143299).

998621 is a wasteful number, since it uses less digits than its factorization.

998621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356 (or 343 counting only the distinct ones).

The product of its digits is 7776, while the sum is 35.

The square root of 998621 is about 999.3102621308. The cubic root of 998621 is about 99.9540121878.

The spelling of 998621 in words is "nine hundred ninety-eight thousand, six hundred twenty-one".