42976521 has 32 divisors (see below), whose sum is σ = 75283200. Its totient is φ = 23708160.

The previous prime is 42976519. The next prime is 42976543. The reversal of 42976521 is 12567924.

42976521 is a `hidden beast` number, since 42 + 97 + 6 + 521 = 666.

It is not a de Polignac number, because 42976521 - 2¹ = 42976519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42976511) 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, 1561 + ... + 9401.

It is an arithmetic number, because the mean of its divisors is an integer number (2352600).

Almost surely, 2^42976521 is an apocalyptic number.

It is an amenable number.

42976521 is a deficient number, since it is larger than the sum of its proper divisors (32306679).

42976521 is a wasteful number, since it uses less digits than its factorization.

42976521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7886 (or 7880 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 42976521 is about 6555.6480228884. The cubic root of 42976521 is about 350.2760298690.

The spelling of 42976521 in words is "forty-two million, nine hundred seventy-six thousand, five hundred twenty-one".