42187725 has 36 divisors (see below), whose sum is σ = 76381396. Its totient is φ = 22256640.

The previous prime is 42187709. The next prime is 42187753. The reversal of 42187725 is 52778124.

It can be written as a sum of positive squares in 6 ways, for example, as 236196 + 41951529 = 486^2 + 6477^2 .

It is not a de Polignac number, because 42187725 - 2⁴ = 42187709 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 42187725.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 20859 + ... + 22791.

Almost surely, 2^42187725 is an apocalyptic number.

42187725 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42187725 is a deficient number, since it is larger than the sum of its proper divisors (34193671).

42187725 is a wasteful number, since it uses less digits than its factorization.

42187725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2046 (or 2038 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

The square root of 42187725 is about 6495.2078488683. The cubic root of 42187725 is about 348.1197813984.

The spelling of 42187725 in words is "forty-two million, one hundred eighty-seven thousand, seven hundred twenty-five".