2152818 has 40 divisors (see below), whose sum is σ = 4909212. Its totient is φ = 705024.

The previous prime is 2152817. The next prime is 2152819. The reversal of 2152818 is 8182512.

It is an interprime number because it is at equal distance from previous prime (2152817) and next prime (2152819).

It can be written as a sum of positive squares in 2 ways, for example, as 2152089 + 729 = 1467^2 + 27^2 .

It is a super-2 number, since 2×2152818² = 9269250682248, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 2152791 and 2152800.

It is not an unprimeable number, because it can be changed into a prime (2152811) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 15646 + ... + 15782.

2^2152818 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2152818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2454606).

2152818 is an abundant number, since it is smaller than the sum of its proper divisors (2756394).

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

2152818 is a wasteful number, since it uses less digits than its factorization.

2152818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248 (or 239 counting only the distinct ones).

The product of its digits is 1280, while the sum is 27.

The square root of 2152818 is about 1467.2484452198. The cubic root of 2152818 is about 129.1226524102.

The spelling of 2152818 in words is "two million, one hundred fifty-two thousand, eight hundred eighteen".