42609971 has 4 divisors (see below), whose sum is σ = 42623832. Its totient is φ = 42596112.

The previous prime is 42609949. The next prime is 42609979. The reversal of 42609971 is 17990624.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 42609971 - 2¹⁰ = 42608947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42609979) 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, 26 + ... + 9231.

It is an arithmetic number, because the mean of its divisors is an integer number (10655958).

Almost surely, 2^42609971 is an apocalyptic number.

42609971 is a deficient number, since it is larger than the sum of its proper divisors (13861).

42609971 is an equidigital number, since it uses as much as digits as its factorization.

42609971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13860.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 42609971 is about 6527.6313468210. The cubic root of 42609971 is about 349.2773415794.

The spelling of 42609971 in words is "forty-two million, six hundred nine thousand, nine hundred seventy-one".