7998213 has 4 divisors (see below), whose sum is σ = 10664288. Its totient is φ = 5332140.

The previous prime is 7998169. The next prime is 7998223. The reversal of 7998213 is 3128997.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 7998213 - 2²¹ = 5901061 is a prime.

It is a super-2 number, since 2×7998213² = 127942822386738, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7998223) 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, 1333033 + ... + 1333038.

It is an arithmetic number, because the mean of its divisors is an integer number (2666072).

Almost surely, 2^7998213 is an apocalyptic number.

It is an amenable number.

7998213 is a deficient number, since it is larger than the sum of its proper divisors (2666075).

7998213 is a wasteful number, since it uses less digits than its factorization.

7998213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2666074.

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

The square root of 7998213 is about 2828.1112071487. Note that the first 3 decimals coincide. The cubic root of 7998213 is about 199.9851072244.

The spelling of 7998213 in words is "seven million, nine hundred ninety-eight thousand, two hundred thirteen".