42166725 has 24 divisors (see below), whose sum is σ = 72123360. Its totient is φ = 21712320.

The previous prime is 42166723. The next prime is 42166753. The reversal of 42166725 is 52766124.

It is not a de Polignac number, because 42166725 - 2¹ = 42166723 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42166721) 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, 7519 + ... + 11868.

It is an arithmetic number, because the mean of its divisors is an integer number (3005140).

Almost surely, 2^42166725 is an apocalyptic number.

It is an amenable number.

42166725 is a deficient number, since it is larger than the sum of its proper divisors (29956635).

42166725 is a wasteful number, since it uses less digits than its factorization.

42166725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19429 (or 19424 counting only the distinct ones).

The product of its digits is 20160, while the sum is 33.

The square root of 42166725 is about 6493.5910712024. The cubic root of 42166725 is about 348.0620100226.

The spelling of 42166725 in words is "forty-two million, one hundred sixty-six thousand, seven hundred twenty-five".