7421998 has 8 divisors (see below), whose sum is σ = 11152008. Its totient is φ = 3704664.

The previous prime is 7421993. The next prime is 7422001. The reversal of 7421998 is 8991247.

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

It is a self number, because there is not a number n which added to its sum of digits gives 7421998.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7421993) 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, 1536 + ... + 4147.

It is an arithmetic number, because the mean of its divisors is an integer number (1394001).

Almost surely, 2^7421998 is an apocalyptic number.

7421998 is a deficient number, since it is larger than the sum of its proper divisors (3730010).

7421998 is a wasteful number, since it uses less digits than its factorization.

7421998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6338.

The product of its digits is 36288, while the sum is 40.

The square root of 7421998 is about 2724.3344141276. The cubic root of 7421998 is about 195.0624213925.

The spelling of 7421998 in words is "seven million, four hundred twenty-one thousand, nine hundred ninety-eight".