42456391 has 4 divisors (see below), whose sum is σ = 43825984. Its totient is φ = 41086800.

The previous prime is 42456389. The next prime is 42456397. The reversal of 42456391 is 19365424.

It is a happy number.

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 42456391 - 2¹ = 42456389 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 (42456397) 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, 684750 + ... + 684811.

It is an arithmetic number, because the mean of its divisors is an integer number (10956496).

Almost surely, 2^42456391 is an apocalyptic number.

42456391 is a deficient number, since it is larger than the sum of its proper divisors (1369593).

42456391 is a wasteful number, since it uses less digits than its factorization.

42456391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1369592.

The product of its digits is 25920, while the sum is 34.

The square root of 42456391 is about 6515.8568891589. The cubic root of 42456391 is about 348.8572005507.

The spelling of 42456391 in words is "forty-two million, four hundred fifty-six thousand, three hundred ninety-one".