8121618 has 12 divisors (see below), whose sum is σ = 17596878. Its totient is φ = 2707200.

The previous prime is 8121613. The next prime is 8121623. The reversal of 8121618 is 8161218.

It is an interprime number because it is at equal distance from previous prime (8121613) and next prime (8121623).

It can be written as a sum of positive squares in only one way, i.e., 7306209 + 815409 = 2703^2 + 903^2 .

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 8121591 and 8121600.

It is not an unprimeable number, because it can be changed into a prime (8121613) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 225583 + ... + 225618.

Almost surely, 2^8121618 is an apocalyptic number.

8121618 is an abundant number, since it is smaller than the sum of its proper divisors (9475260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8121618 is a wasteful number, since it uses less digits than its factorization.

8121618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451209 (or 451206 counting only the distinct ones).

The product of its digits is 768, while the sum is 27.

The square root of 8121618 is about 2849.8452589571. The cubic root of 8121618 is about 201.0083905312.

The spelling of 8121618 in words is "eight million, one hundred twenty-one thousand, six hundred eighteen".