3866781 has 8 divisors (see below), whose sum is σ = 5178240. Its totient is φ = 2566592.

The previous prime is 3866777. The next prime is 3866791. The reversal of 3866781 is 1876683.

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 3866781 - 2² = 3866777 is a prime.

It is a super-2 number, since 2×3866781² = 29903990603922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3866741) 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, 1980 + ... + 3413.

It is an arithmetic number, because the mean of its divisors is an integer number (647280).

Almost surely, 2^3866781 is an apocalyptic number.

It is an amenable number.

3866781 is a deficient number, since it is larger than the sum of its proper divisors (1311459).

3866781 is a wasteful number, since it uses less digits than its factorization.

3866781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5635.

The product of its digits is 48384, while the sum is 39.

The square root of 3866781 is about 1966.4132322582. The cubic root of 3866781 is about 156.9579045188.

The spelling of 3866781 in words is "three million, eight hundred sixty-six thousand, seven hundred eighty-one".