42647431 has 4 divisors (see below), whose sum is σ = 42678352. Its totient is φ = 42616512.

The previous prime is 42647417. The next prime is 42647447. The reversal of 42647431 is 13474624.

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

It is a cyclic number.

It is not a de Polignac number, because 42647431 - 2⁷ = 42647303 is a prime.

It is a super-2 number, since 2×42647431² = 3637606741799522, which contains 22 as substring.

It is the 6531-st Hogben number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42647393 and 42647402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42647411) by changing a digit.

It is a nontrivial repunit in base 6530.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13290 + ... + 16183.

It is an arithmetic number, because the mean of its divisors is an integer number (10669588).

Almost surely, 2^42647431 is an apocalyptic number.

42647431 is a deficient number, since it is larger than the sum of its proper divisors (30921).

42647431 is a wasteful number, since it uses less digits than its factorization.

42647431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30920.

The product of its digits is 16128, while the sum is 31.

The square root of 42647431 is about 6530.5000574229. The cubic root of 42647431 is about 349.3796658054.

The spelling of 42647431 in words is "forty-two million, six hundred forty-seven thousand, four hundred thirty-one".