42240025 has 6 divisors (see below), whose sum is σ = 52377662. Its totient is φ = 33792000.

The previous prime is 42240017. The next prime is 42240031. The reversal of 42240025 is 52004224.

It can be written as a sum of positive squares in 3 ways, for example, as 5322249 + 36917776 = 2307^2 + 6076^2 .

It is not a de Polignac number, because 42240025 - 2³ = 42240017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42239984 and 42240011.

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, 844776 + ... + 844825.

Almost surely, 2^42240025 is an apocalyptic number.

It is an amenable number.

42240025 is a deficient number, since it is larger than the sum of its proper divisors (10137637).

42240025 is a wasteful number, since it uses less digits than its factorization.

42240025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1689611 (or 1689606 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 42240025 is about 6499.2326470130. The cubic root of 42240025 is about 348.2635763542.

Adding to 42240025 its reverse (52004224), we get a palindrome (94244249).

The spelling of 42240025 in words is "forty-two million, two hundred forty thousand, twenty-five".