4063521 has 32 divisors (see below), whose sum is σ = 6912000. Its totient is φ = 2105040.

The previous prime is 4063517. The next prime is 4063537. The reversal of 4063521 is 1253604.

It is a happy number.

It is not a de Polignac number, because 4063521 - 2² = 4063517 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (4063021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11140 + ... + 11498.

It is an arithmetic number, because the mean of its divisors is an integer number (216000).

Almost surely, 2^4063521 is an apocalyptic number.

It is an amenable number.

4063521 is a deficient number, since it is larger than the sum of its proper divisors (2848479).

4063521 is a wasteful number, since it uses less digits than its factorization.

4063521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394 (or 380 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 4063521 is about 2015.8177000910. The cubic root of 4063521 is about 159.5759736070.

The spelling of 4063521 in words is "four million, sixty-three thousand, five hundred twenty-one".