42180397 has 4 divisors (see below), whose sum is σ = 48206176. Its totient is φ = 36154620.

The previous prime is 42180389. The next prime is 42180403. The reversal of 42180397 is 79308124.

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 42180397 - 2³ = 42180389 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 (42180317) 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, 3012879 + ... + 3012892.

It is an arithmetic number, because the mean of its divisors is an integer number (12051544).

Almost surely, 2^42180397 is an apocalyptic number.

It is an amenable number.

42180397 is a deficient number, since it is larger than the sum of its proper divisors (6025779).

42180397 is an equidigital number, since it uses as much as digits as its factorization.

42180397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6025778.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 42180397 is about 6494.6437161710. The cubic root of 42180397 is about 348.0996241174.

The spelling of 42180397 in words is "forty-two million, one hundred eighty thousand, three hundred ninety-seven".