7818212 has 6 divisors (see below), whose sum is σ = 13681878. Its totient is φ = 3909104.

The previous prime is 7818191. The next prime is 7818221. The reversal of 7818212 is 2128187.

It can be written as a sum of positive squares in only one way, i.e., 7054336 + 763876 = 2656^2 + 874^2 .

It is a super-2 number, since 2×7818212² = 122248877753888, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 977273 + ... + 977280.

It is an arithmetic number, because the mean of its divisors is an integer number (2280313).

Almost surely, 2^7818212 is an apocalyptic number.

It is an amenable number.

7818212 is a deficient number, since it is larger than the sum of its proper divisors (5863666).

7818212 is a wasteful number, since it uses less digits than its factorization.

7818212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1954557 (or 1954555 counting only the distinct ones).

The product of its digits is 1792, while the sum is 29.

The square root of 7818212 is about 2796.1065787985. The cubic root of 7818212 is about 198.4734783009.

The spelling of 7818212 in words is "seven million, eight hundred eighteen thousand, two hundred twelve".