42045172 has 54 divisors (see below), whose sum is σ = 83872194. Its totient is φ = 18420480.

The previous prime is 42045161. The next prime is 42045181. The reversal of 42045172 is 27154024.

It can be written as a sum of positive squares in 9 ways, for example, as 34058896 + 7986276 = 5836^2 + 2826^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1025472 + ... + 1025512.

Almost surely, 2^42045172 is an apocalyptic number.

It is an amenable number.

42045172 is a deficient number, since it is larger than the sum of its proper divisors (41827022).

42045172 is a wasteful number, since it uses less digits than its factorization.

42045172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149 (or 93 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 42045172 is about 6484.2248572979. The cubic root of 42045172 is about 347.7272381526.

Adding to 42045172 its reverse (27154024), we get a palindrome (69199196).

The spelling of 42045172 in words is "forty-two million, forty-five thousand, one hundred seventy-two".