3816181 has 4 divisors (see below), whose sum is σ = 3820864. Its totient is φ = 3811500.

The previous prime is 3816173. The next prime is 3816187. The reversal of 3816181 is 1816183.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1816183 = 29 ⋅62627.

It is a cyclic number.

It is not a de Polignac number, because 3816181 - 2³ = 3816173 is a prime.

It is a super-2 number, since 2×3816181² = 29126474849522, which contains 22 as substring.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3816187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 765 + ... + 2866.

It is an arithmetic number, because the mean of its divisors is an integer number (955216).

Almost surely, 2^3816181 is an apocalyptic number.

It is an amenable number.

3816181 is a deficient number, since it is larger than the sum of its proper divisors (4683).

3816181 is a wasteful number, since it uses less digits than its factorization.

3816181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4682.

The product of its digits is 1152, while the sum is 28.

The square root of 3816181 is about 1953.5047990727. The cubic root of 3816181 is about 156.2702552941.

The spelling of 3816181 in words is "three million, eight hundred sixteen thousand, one hundred eighty-one".