42505425 has 24 divisors (see below), whose sum is σ = 78085280. Its totient is φ = 22669200.

The previous prime is 42505381. The next prime is 42505427. The reversal of 42505425 is 52450524.

It is not a de Polignac number, because 42505425 - 2¹⁸ = 42243281 is a prime.

It is a super-2 number, since 2×42505425² = 3613422308861250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42505427) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30811 + ... + 32160.

Almost surely, 2^42505425 is an apocalyptic number.

42505425 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42505425 is a deficient number, since it is larger than the sum of its proper divisors (35579855).

42505425 is a wasteful number, since it uses less digits than its factorization.

42505425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62990 (or 62979 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 27.

The square root of 42505425 is about 6519.6184704321. The cubic root of 42505425 is about 348.9914503260.

Adding to 42505425 its reverse (52450524), we get a palindrome (94955949).

The spelling of 42505425 in words is "forty-two million, five hundred five thousand, four hundred twenty-five".