42562721 has 4 divisors (see below), whose sum is σ = 43935744. Its totient is φ = 41189700.

The previous prime is 42562711. The next prime is 42562753. The reversal of 42562721 is 12726524.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 42562721 - 2¹⁰ = 42561697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42562711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 686465 + ... + 686526.

It is an arithmetic number, because the mean of its divisors is an integer number (10983936).

Almost surely, 2^42562721 is an apocalyptic number.

It is an amenable number.

42562721 is a deficient number, since it is larger than the sum of its proper divisors (1373023).

42562721 is a wasteful number, since it uses less digits than its factorization.

42562721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1373022.

The product of its digits is 6720, while the sum is 29.

The square root of 42562721 is about 6524.0111128048. The cubic root of 42562721 is about 349.1481898189.

The spelling of 42562721 in words is "forty-two million, five hundred sixty-two thousand, seven hundred twenty-one".