4076521 has 4 divisors (see below), whose sum is σ = 4097412. Its totient is φ = 4055632.

The previous prime is 4076489. The next prime is 4076537. The reversal of 4076521 is 1256704.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3861225 + 215296 = 1965^2 + 464^2 .

It is a cyclic number.

It is not a de Polignac number, because 4076521 - 2⁵ = 4076489 is a prime.

It is a Duffinian number.

4076521 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (4076591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10150 + ... + 10543.

It is an arithmetic number, because the mean of its divisors is an integer number (1024353).

Almost surely, 2^4076521 is an apocalyptic number.

It is an amenable number.

4076521 is a deficient number, since it is larger than the sum of its proper divisors (20891).

4076521 is a wasteful number, since it uses less digits than its factorization.

4076521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20890.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 4076521 is about 2019.0396231872. The cubic root of 4076521 is about 159.7459640619.

The spelling of 4076521 in words is "four million, seventy-six thousand, five hundred twenty-one".