42218725 has 12 divisors (see below), whose sum is σ = 53629380. Its totient is φ = 32950400.

The previous prime is 42218723. The next prime is 42218749. The reversal of 42218725 is 52781224.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 21986721 + 20232004 = 4689^2 + 4498^2 .

It is not a de Polignac number, because 42218725 - 2¹ = 42218723 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42218723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19570 + ... + 21619.

It is an arithmetic number, because the mean of its divisors is an integer number (4469115).

Almost surely, 2^42218725 is an apocalyptic number.

It is an amenable number.

42218725 is a deficient number, since it is larger than the sum of its proper divisors (11410655).

42218725 is a wasteful number, since it uses less digits than its factorization.

42218725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41240 (or 41235 counting only the distinct ones).

The product of its digits is 8960, while the sum is 31.

The square root of 42218725 is about 6497.5937853947. The cubic root of 42218725 is about 348.2050279246.

Adding to 42218725 its reverse (52781224), we get a palindrome (94999949).

The spelling of 42218725 in words is "forty-two million, two hundred eighteen thousand, seven hundred twenty-five".