3866421 has 8 divisors (see below), whose sum is σ = 5551840. Its totient is φ = 2379312.

The previous prime is 3866419. The next prime is 3866437. The reversal of 3866421 is 1246683.

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

It is not a de Polignac number, because 3866421 - 2¹ = 3866419 is a prime.

It is a super-2 number, since 2×3866421² = 29898422698482, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3866441) 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, 49531 + ... + 49608.

It is an arithmetic number, because the mean of its divisors is an integer number (693980).

Almost surely, 2^3866421 is an apocalyptic number.

It is an amenable number.

3866421 is a deficient number, since it is larger than the sum of its proper divisors (1685419).

3866421 is a wasteful number, since it uses less digits than its factorization.

3866421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99155.

The product of its digits is 6912, while the sum is 30.

The square root of 3866421 is about 1966.3216929079. The cubic root of 3866421 is about 156.9530334042.

The spelling of 3866421 in words is "three million, eight hundred sixty-six thousand, four hundred twenty-one".