7321998 has 8 divisors (see below), whose sum is σ = 14644008. Its totient is φ = 2440664.

The previous prime is 7321987. The next prime is 7322023. The reversal of 7321998 is 8991237.

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

7321998 is an admirable number.

It is a super-2 number, since 2×7321998² = 107223309424008, which contains 22 as substring.

It is a nialpdrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 610161 + ... + 610172.

It is an arithmetic number, because the mean of its divisors is an integer number (1830501).

Almost surely, 2^7321998 is an apocalyptic number.

7321998 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7321998 is a wasteful number, since it uses less digits than its factorization.

7321998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1220338.

The product of its digits is 27216, while the sum is 39.

The square root of 7321998 is about 2705.9190675259. The cubic root of 7321998 is about 194.1824018717.

The spelling of 7321998 in words is "seven million, three hundred twenty-one thousand, nine hundred ninety-eight".