3902181 has 4 divisors (see below), whose sum is σ = 5202912. Its totient is φ = 2601452.

The previous prime is 3902167. The next prime is 3902209. The reversal of 3902181 is 1812093.

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 an emirpimes, since its reverse is a distinct semiprime: 1812093 = 3 ⋅604031.

It is a cyclic number.

It is not a de Polignac number, because 3902181 - 2⁵ = 3902149 is a prime.

It is a super-2 number, since 2×3902181² = 30454033113522, which contains 22 as substring.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3902141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 650361 + ... + 650366.

It is an arithmetic number, because the mean of its divisors is an integer number (1300728).

Almost surely, 2^3902181 is an apocalyptic number.

It is an amenable number.

3902181 is a deficient number, since it is larger than the sum of its proper divisors (1300731).

3902181 is a wasteful number, since it uses less digits than its factorization.

3902181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1300730.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 3902181 is about 1975.3938847734. The cubic root of 3902181 is about 157.4354283051.

The spelling of 3902181 in words is "three million, nine hundred two thousand, one hundred eighty-one".