7121998 has 24 divisors (see below), whose sum is σ = 12187800. Its totient is φ = 3111264.

The previous prime is 7121993. The next prime is 7121999. The reversal of 7121998 is 8991217.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7121993) 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, 5868 + ... + 6976.

It is an arithmetic number, because the mean of its divisors is an integer number (507825).

Almost surely, 2^7121998 is an apocalyptic number.

7121998 is a deficient number, since it is larger than the sum of its proper divisors (5065802).

7121998 is a wasteful number, since it uses less digits than its factorization.

7121998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156 (or 1143 counting only the distinct ones).

The product of its digits is 9072, while the sum is 37.

The square root of 7121998 is about 2668.7071776424. The cubic root of 7121998 is about 192.3980277373.

It can be divided in two parts, 71219 and 98, that added together give a palindrome (71317).

The spelling of 7121998 in words is "seven million, one hundred twenty-one thousand, nine hundred ninety-eight".