42456431 has 4 divisors (see below), whose sum is σ = 44691000. Its totient is φ = 40221864.

The previous prime is 42456397. The next prime is 42456433. The reversal of 42456431 is 13465424.

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 42456431 - 2¹⁸ = 42194287 is a prime.

It is a super-2 number, since 2×42456431² = 3605097066515522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42456394 and 42456403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42456433) 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, 1117256 + ... + 1117293.

It is an arithmetic number, because the mean of its divisors is an integer number (11172750).

Almost surely, 2^42456431 is an apocalyptic number.

42456431 is a deficient number, since it is larger than the sum of its proper divisors (2234569).

42456431 is a wasteful number, since it uses less digits than its factorization.

42456431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2234568.

The product of its digits is 11520, while the sum is 29.

The square root of 42456431 is about 6515.8599585933. The cubic root of 42456431 is about 348.8573101085.

The spelling of 42456431 in words is "forty-two million, four hundred fifty-six thousand, four hundred thirty-one".