3865421 has 16 divisors (see below), whose sum is σ = 4669440. Its totient is φ = 3129840.

The previous prime is 3865363. The next prime is 3865429. The reversal of 3865421 is 1245683.

It is not a de Polignac number, because 3865421 - 2¹⁸ = 3603277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3865429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10010 + ... + 10388.

It is an arithmetic number, because the mean of its divisors is an integer number (291840).

Almost surely, 2^3865421 is an apocalyptic number.

3865421 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3865421 is a deficient number, since it is larger than the sum of its proper divisors (804019).

3865421 is a wasteful number, since it uses less digits than its factorization.

3865421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464.

The product of its digits is 5760, while the sum is 29.

The square root of 3865421 is about 1966.0673945722. The cubic root of 3865421 is about 156.9395009439.

The spelling of 3865421 in words is "three million, eight hundred sixty-five thousand, four hundred twenty-one".