42215025 has 48 divisors (see below), whose sum is σ = 73392128. Its totient is φ = 21384000.

The previous prime is 42215023. The next prime is 42215027. The reversal of 42215025 is 52051224.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (42215023) and next prime (42215027).

It is not a de Polignac number, because 42215025 - 2¹ = 42215023 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 42214992 and 42215010.

It is not an unprimeable number, because it can be changed into a prime (42215023) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 155640 + ... + 155910.

Almost surely, 2^42215025 is an apocalyptic number.

It is an amenable number.

42215025 is a deficient number, since it is larger than the sum of its proper divisors (31177103).

42215025 is a wasteful number, since it uses less digits than its factorization.

42215025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382 (or 377 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 42215025 is about 6497.3090583718. The cubic root of 42215025 is about 348.1948555327.

Adding to 42215025 its reverse (52051224), we get a palindrome (94266249).

The spelling of 42215025 in words is "forty-two million, two hundred fifteen thousand, twenty-five".