4001535 has 16 divisors (see below), whose sum is σ = 7114080. Its totient is φ = 2134080.

The previous prime is 4001531. The next prime is 4001549. The reversal of 4001535 is 5351004.

It is not a de Polignac number, because 4001535 - 2² = 4001531 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4001531) 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, 14686 + ... + 14955.

It is an arithmetic number, because the mean of its divisors is an integer number (444630).

Almost surely, 2^4001535 is an apocalyptic number.

4001535 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

4001535 is a deficient number, since it is larger than the sum of its proper divisors (3112545).

4001535 is a wasteful number, since it uses less digits than its factorization.

4001535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29655 (or 29649 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 4001535 is about 2000.3837131910. The cubic root of 4001535 is about 158.7604081051.

Adding to 4001535 its reverse (5351004), we get a palindrome (9352539).

The spelling of 4001535 in words is "four million, one thousand, five hundred thirty-five".