42145725 has 12 divisors (see below), whose sum is σ = 69681056. Its totient is φ = 22477680.

The previous prime is 42145717. The next prime is 42145751. The reversal of 42145725 is 52754124.

It is not a de Polignac number, because 42145725 - 2³ = 42145717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42145692 and 42145701.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 280897 + ... + 281046.

Almost surely, 2^42145725 is an apocalyptic number.

It is an amenable number.

42145725 is a deficient number, since it is larger than the sum of its proper divisors (27535331).

42145725 is a wasteful number, since it uses less digits than its factorization.

42145725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561956 (or 561951 counting only the distinct ones).

The product of its digits is 11200, while the sum is 30.

The square root of 42145725 is about 6491.9738908902. The cubic root of 42145725 is about 348.0042194626.

Adding to 42145725 its reverse (52754124), we get a palindrome (94899849).

The spelling of 42145725 in words is "forty-two million, one hundred forty-five thousand, seven hundred twenty-five".