42115725 has 18 divisors (see below), whose sum is σ = 75434346. Its totient is φ = 22461600.

The previous prime is 42115699. The next prime is 42115727. The reversal of 42115725 is 52751124.

It can be written as a sum of positive squares in 3 ways, for example, as 86436 + 42029289 = 294^2 + 6483^2 .

It is not a de Polignac number, because 42115725 - 2⁵ = 42115693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42115727) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 93366 + ... + 93815.

It is an arithmetic number, because the mean of its divisors is an integer number (4190797).

Almost surely, 2^42115725 is an apocalyptic number.

42115725 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42115725 is a deficient number, since it is larger than the sum of its proper divisors (33318621).

42115725 is a wasteful number, since it uses less digits than its factorization.

42115725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187197 (or 187189 counting only the distinct ones).

The product of its digits is 2800, while the sum is 27.

The square root of 42115725 is about 6489.6629342363. The cubic root of 42115725 is about 347.9216282096.

Adding to 42115725 its reverse (52751124), we get a palindrome (94866849).

The spelling of 42115725 in words is "forty-two million, one hundred fifteen thousand, seven hundred twenty-five".