4057521 has 24 divisors (see below), whose sum is σ = 6008256. Its totient is φ = 2433600.

The previous prime is 4057513. The next prime is 4057553. The reversal of 4057521 is 1257504.

It is not a de Polignac number, because 4057521 - 2³ = 4057513 is a prime.

4057521 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 4057491 and 4057500.

It is not an unprimeable number, because it can be changed into a prime (4057511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26796 + ... + 26946.

It is an arithmetic number, because the mean of its divisors is an integer number (250344).

Almost surely, 2^4057521 is an apocalyptic number.

It is an amenable number.

4057521 is a deficient number, since it is larger than the sum of its proper divisors (1950735).

4057521 is a wasteful number, since it uses less digits than its factorization.

4057521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 4057521 is about 2014.3289205093. The cubic root of 4057521 is about 159.4973941785.

The spelling of 4057521 in words is "four million, fifty-seven thousand, five hundred twenty-one".