42825721 has 16 divisors (see below), whose sum is σ = 46157760. Its totient is φ = 39654720.

The previous prime is 42825719. The next prime is 42825743. The reversal of 42825721 is 12752824.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 42825721 - 2¹ = 42825719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42825751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75786 + ... + 76348.

It is an arithmetic number, because the mean of its divisors is an integer number (2884860).

Almost surely, 2^42825721 is an apocalyptic number.

It is an amenable number.

42825721 is a deficient number, since it is larger than the sum of its proper divisors (3332039).

42825721 is a wasteful number, since it uses less digits than its factorization.

42825721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696.

The product of its digits is 8960, while the sum is 31.

The square root of 42825721 is about 6544.1363830532. The cubic root of 42825721 is about 349.8658560764.

The spelling of 42825721 in words is "forty-two million, eight hundred twenty-five thousand, seven hundred twenty-one".