42725409 has 16 divisors (see below), whose sum is σ = 58996224. Its totient is φ = 27475200.

The previous prime is 42725401. The next prime is 42725453. The reversal of 42725409 is 90452724.

It is not a de Polignac number, because 42725409 - 2³ = 42725401 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42725409.

It is not an unprimeable number, because it can be changed into a prime (42725401) 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 15 ways as a sum of consecutive naturals, for example, 39739 + ... + 40799.

It is an arithmetic number, because the mean of its divisors is an integer number (3687264).

Almost surely, 2^42725409 is an apocalyptic number.

It is an amenable number.

42725409 is a deficient number, since it is larger than the sum of its proper divisors (16270815).

42725409 is a wasteful number, since it uses less digits than its factorization.

42725409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1528.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 42725409 is about 6536.4676240306. The cubic root of 42725409 is about 349.5924753402.

It can be divided in two parts, 42725 and 409, that added together give a palindrome (43134).

The spelling of 42725409 in words is "forty-two million, seven hundred twenty-five thousand, four hundred nine".