42212725 has 6 divisors (see below), whose sum is σ = 52343810. Its totient is φ = 33770160.

The previous prime is 42212711. The next prime is 42212741. The reversal of 42212725 is 52721224.

It can be written as a sum of positive squares in 3 ways, for example, as 8375236 + 33837489 = 2894^2 + 5817^2 .

It is a de Polignac number, because none of the positive numbers 2^k-42212725 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 1688509 = 42212725 / (4 + 2 + 2 + 1 + 2 + 7 + 2 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 42212725.

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, 844230 + ... + 844279.

Almost surely, 2^42212725 is an apocalyptic number.

It is an amenable number.

42212725 is a deficient number, since it is larger than the sum of its proper divisors (10131085).

42212725 is a wasteful number, since it uses less digits than its factorization.

42212725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1688519 (or 1688514 counting only the distinct ones).

The product of its digits is 2240, while the sum is 25.

The square root of 42212725 is about 6497.1320596091. The cubic root of 42212725 is about 348.1885318544.

Adding to 42212725 its reverse (52721224), we get a palindrome (94933949).

The spelling of 42212725 in words is "forty-two million, two hundred twelve thousand, seven hundred twenty-five".