42180997 has 4 divisors (see below), whose sum is σ = 42198336. Its totient is φ = 42163660.

The previous prime is 42180967. The next prime is 42181001. The reversal of 42180997 is 79908124.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42180997 - 2¹¹ = 42178949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42180907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4279 + ... + 10132.

It is an arithmetic number, because the mean of its divisors is an integer number (10549584).

Almost surely, 2^42180997 is an apocalyptic number.

It is an amenable number.

42180997 is a deficient number, since it is larger than the sum of its proper divisors (17339).

42180997 is a wasteful number, since it uses less digits than its factorization.

42180997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17338.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 42180997 is about 6494.6899079171. The cubic root of 42180997 is about 348.1012746376.

It can be divided in two parts, 421 and 80997, that added together give a palindrome (81418).

The spelling of 42180997 in words is "forty-two million, one hundred eighty thousand, nine hundred ninety-seven".