42724525 has 6 divisors (see below), whose sum is σ = 52978442. Its totient is φ = 34179600.

The previous prime is 42724481. The next prime is 42724531. The reversal of 42724525 is 52542724.

It can be written as a sum of positive squares in 3 ways, for example, as 5294601 + 37429924 = 2301^2 + 6118^2 .

It is not a de Polignac number, because 42724525 - 2¹⁹ = 42200237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 854466 + ... + 854515.

Almost surely, 2^42724525 is an apocalyptic number.

It is an amenable number.

42724525 is a deficient number, since it is larger than the sum of its proper divisors (10253917).

42724525 is a wasteful number, since it uses less digits than its factorization.

42724525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1708991 (or 1708986 counting only the distinct ones).

The product of its digits is 22400, while the sum is 31.

The square root of 42724525 is about 6536.4000030598. The cubic root of 42724525 is about 349.5900642700.

The spelling of 42724525 in words is "forty-two million, seven hundred twenty-four thousand, five hundred twenty-five".