2818381 has 8 divisors (see below), whose sum is σ = 2943864. Its totient is φ = 2695680.

The previous prime is 2818369. The next prime is 2818391. The reversal of 2818381 is 1838182.

It can be written as a sum of positive squares in 4 ways, for example, as 872356 + 1946025 = 934^2 + 1395^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2818381 - 2¹⁵ = 2785613 is a prime.

It is a super-2 number, since 2×2818381² = 15886542922322, which contains 22 as substring.

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 (2818391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1525 + ... + 2821.

It is an arithmetic number, because the mean of its divisors is an integer number (367983).

2^2818381 is an apocalyptic number.

It is an amenable number.

2818381 is a deficient number, since it is larger than the sum of its proper divisors (125483).

2818381 is a wasteful number, since it uses less digits than its factorization.

2818381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1391.

The product of its digits is 3072, while the sum is 31.

The square root of 2818381 is about 1678.8034429319. The cubic root of 2818381 is about 141.2537221981.

The spelling of 2818381 in words is "two million, eight hundred eighteen thousand, three hundred eighty-one".