42974721 has 6 divisors (see below), whose sum is σ = 62074610. Its totient is φ = 28649808.

The previous prime is 42974719. The next prime is 42974747. The reversal of 42974721 is 12747924.

42974721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 34680321 + 8294400 = 5889^2 + 2880^2 .

It is not a de Polignac number, because 42974721 - 2¹ = 42974719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42974021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2387476 + ... + 2387493.

Almost surely, 2^42974721 is an apocalyptic number.

It is an amenable number.

42974721 is a deficient number, since it is larger than the sum of its proper divisors (19099889).

42974721 is a wasteful number, since it uses less digits than its factorization.

42974721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4774975 (or 4774972 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 42974721 is about 6555.5107352517. The cubic root of 42974721 is about 350.2711395580.

The spelling of 42974721 in words is "forty-two million, nine hundred seventy-four thousand, seven hundred twenty-one".