42006725 has 6 divisors (see below), whose sum is σ = 52088370. Its totient is φ = 33605360.

The previous prime is 42006721. The next prime is 42006737. The reversal of 42006725 is 52760024.

It can be written as a sum of positive squares in 3 ways, for example, as 3364 + 42003361 = 58^2 + 6481^2 .

It is not a de Polignac number, because 42006725 - 2² = 42006721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42006694 and 42006703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42006721) 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 5 ways as a sum of consecutive naturals, for example, 840110 + ... + 840159.

It is an arithmetic number, because the mean of its divisors is an integer number (8681395).

Almost surely, 2^42006725 is an apocalyptic number.

It is an amenable number.

42006725 is a deficient number, since it is larger than the sum of its proper divisors (10081645).

42006725 is a wasteful number, since it uses less digits than its factorization.

42006725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1680279 (or 1680274 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 42006725 is about 6481.2595226545. The cubic root of 42006725 is about 347.6212161011.

Adding to 42006725 its reverse (52760024), we get a palindrome (94766749).

The spelling of 42006725 in words is "forty-two million, six thousand, seven hundred twenty-five".