3918213 has 30 divisors (see below), whose sum is σ = 6408402. Its totient is φ = 2371680.

The previous prime is 3918209. The next prime is 3918251. The reversal of 3918213 is 3128193.

It can be written as a sum of positive squares in 3 ways, for example, as 613089 + 3305124 = 783^2 + 1818^2 .

It is not a de Polignac number, because 3918213 - 2² = 3918209 is a prime.

It is a super-2 number, since 2×3918213² = 30704786226738, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3918283) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 64203 + ... + 64263.

Almost surely, 2^3918213 is an apocalyptic number.

It is an amenable number.

3918213 is a deficient number, since it is larger than the sum of its proper divisors (2490189).

3918213 is an equidigital number, since it uses as much as digits as its factorization.

3918213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147 (or 77 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 3918213 is about 1979.4476502297. The cubic root of 3918213 is about 157.6507400375.

The spelling of 3918213 in words is "three million, nine hundred eighteen thousand, two hundred thirteen".