42072169 has 4 divisors (see below), whose sum is σ = 42544980. Its totient is φ = 41599360.

The previous prime is 42072157. The next prime is 42072193. The reversal of 42072169 is 96127024.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3196944 + 38875225 = 1788^2 + 6235^2 .

It is a cyclic number.

It is not a de Polignac number, because 42072169 - 2⁹ = 42071657 is a prime.

It is a super-2 number, since 2×42072169² = 3540134808729122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42072169.

It is not an unprimeable number, because it can be changed into a prime (42072269) 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, 236272 + ... + 236449.

It is an arithmetic number, because the mean of its divisors is an integer number (10636245).

Almost surely, 2^42072169 is an apocalyptic number.

It is an amenable number.

42072169 is a deficient number, since it is larger than the sum of its proper divisors (472811).

42072169 is an equidigital number, since it uses as much as digits as its factorization.

42072169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472810.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 42072169 is about 6486.3062678230. The cubic root of 42072169 is about 347.8016468840.

The spelling of 42072169 in words is "forty-two million, seventy-two thousand, one hundred sixty-nine".