4013865 has 24 divisors (see below), whose sum is σ = 7008768. Its totient is φ = 2124960.

The previous prime is 4013857. The next prime is 4013881. The reversal of 4013865 is 5683104.

It is not a de Polignac number, because 4013865 - 2³ = 4013857 is a prime.

It is a super-2 number, since 2×4013865² = 32222224476450, which contains 22 as substring.

4013865 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8362 + ... + 8828.

It is an arithmetic number, because the mean of its divisors is an integer number (292032).

Almost surely, 2^4013865 is an apocalyptic number.

4013865 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

4013865 is a deficient number, since it is larger than the sum of its proper divisors (2994903).

4013865 is a wasteful number, since it uses less digits than its factorization.

4013865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669 (or 666 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 4013865 is about 2003.4632514723. The cubic root of 4013865 is about 158.9233046511.

Adding to 4013865 its reverse (5683104), we get a palindrome (9696969).

The spelling of 4013865 in words is "four million, thirteen thousand, eight hundred sixty-five".