7918213 has 4 divisors (see below), whose sum is σ = 8052480. Its totient is φ = 7783948.

The previous prime is 7918201. The next prime is 7918223. The reversal of 7918213 is 3128197.

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 a cyclic number.

It is not a de Polignac number, because 7918213 - 2¹⁷ = 7787141 is a prime.

It is a super-2 number, since 2×7918213² = 125396194226738, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7918223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67045 + ... + 67162.

It is an arithmetic number, because the mean of its divisors is an integer number (2013120).

Almost surely, 2^7918213 is an apocalyptic number.

It is an amenable number.

7918213 is a deficient number, since it is larger than the sum of its proper divisors (134267).

7918213 is a wasteful number, since it uses less digits than its factorization.

7918213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134266.

The product of its digits is 3024, while the sum is 31.

The square root of 7918213 is about 2813.9319465829. The cubic root of 7918213 is about 199.3161057757.

The spelling of 7918213 in words is "seven million, nine hundred eighteen thousand, two hundred thirteen".