42408225 has 24 divisors (see below), whose sum is σ = 77906720. Its totient is φ = 22617360.

The previous prime is 42408203. The next prime is 42408259. The reversal of 42408225 is 52280424.

It is a happy number.

It is not a de Polignac number, because 42408225 - 2⁵ = 42408193 is a prime.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30739 + ... + 32088.

Almost surely, 2^42408225 is an apocalyptic number.

42408225 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42408225 is a deficient number, since it is larger than the sum of its proper divisors (35498495).

42408225 is a wasteful number, since it uses less digits than its factorization.

42408225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62846 (or 62835 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 27.

The square root of 42408225 is about 6512.1597799808. The cubic root of 42408225 is about 348.7252265904.

Adding to 42408225 its reverse (52280424), we get a palindrome (94688649).

The spelling of 42408225 in words is "forty-two million, four hundred eight thousand, two hundred twenty-five".