3878181 has 6 divisors (see below), whose sum is σ = 5601830. Its totient is φ = 2585448.

The previous prime is 3878177. The next prime is 3878183. The reversal of 3878181 is 1818783.

It can be written as a sum of positive squares in only one way, i.e., 3744225 + 133956 = 1935^2 + 366^2 .

It is not a de Polignac number, because 3878181 - 2² = 3878177 is a prime.

It is a super-2 number, since 2×3878181² = 30080575737522, which contains 22 as substring.

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

It is a Duffinian number.

3878181 is a modest number, since divided by 8181 gives 387 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3878183) 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, 215446 + ... + 215463.

Almost surely, 2^3878181 is an apocalyptic number.

It is an amenable number.

3878181 is a deficient number, since it is larger than the sum of its proper divisors (1723649).

3878181 is a wasteful number, since it uses less digits than its factorization.

3878181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430915 (or 430912 counting only the distinct ones).

The product of its digits is 10752, while the sum is 36.

The square root of 3878181 is about 1969.3097775617. The cubic root of 3878181 is about 157.1120003561.

The spelling of 3878181 in words is "three million, eight hundred seventy-eight thousand, one hundred eighty-one".