4218525 has 18 divisors (see below), whose sum is σ = 7556250. Its totient is φ = 2249760.

The previous prime is 4218517. The next prime is 4218541. The reversal of 4218525 is 5258124.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 427716 + 3790809 = 654^2 + 1947^2 .

It is not a de Polignac number, because 4218525 - 2³ = 4218517 is a prime.

It is a congruent number.

It is an unprimeable number.

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 17 ways as a sum of consecutive naturals, for example, 9150 + ... + 9599.

Almost surely, 2^4218525 is an apocalyptic number.

4218525 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

4218525 is a deficient number, since it is larger than the sum of its proper divisors (3337725).

4218525 is a wasteful number, since it uses less digits than its factorization.

4218525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18765 (or 18757 counting only the distinct ones).

The product of its digits is 3200, while the sum is 27.

The square root of 4218525 is about 2053.9048176583. The cubic root of 4218525 is about 161.5797291217.

The spelling of 4218525 in words is "four million, two hundred eighteen thousand, five hundred twenty-five".