4001015 has 16 divisors (see below), whose sum is σ = 5031936. Its totient is φ = 3050400.

The previous prime is 4001009. The next prime is 4001017. The reversal of 4001015 is 5101004.

It is not a de Polignac number, because 4001015 - 2⁶ = 4000951 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4000987 and 4001005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4001017) 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, 12710 + ... + 13020.

It is an arithmetic number, because the mean of its divisors is an integer number (314496).

Almost surely, 2^4001015 is an apocalyptic number.

4001015 is a deficient number, since it is larger than the sum of its proper divisors (1030921).

4001015 is a wasteful number, since it uses less digits than its factorization.

4001015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430.

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 4001015 is about 2000.2537339048. The cubic root of 4001015 is about 158.7535308285.

Subtracting from 4001015 its sum of digits (11), we obtain a palindrome (4001004).

Adding to 4001015 its reverse (5101004), we get a palindrome (9102019).

The spelling of 4001015 in words is "four million, one thousand, fifteen".