42434781 has 4 divisors (see below), whose sum is σ = 56579712. Its totient is φ = 28289852.

The previous prime is 42434779. The next prime is 42434797. The reversal of 42434781 is 18743424.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42434781 - 2¹ = 42434779 is a prime.

It is a super-2 number, since 2×42434781² = 3601421277035922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42434731) 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, 7072461 + ... + 7072466.

It is an arithmetic number, because the mean of its divisors is an integer number (14144928).

Almost surely, 2^42434781 is an apocalyptic number.

It is an amenable number.

42434781 is a deficient number, since it is larger than the sum of its proper divisors (14144931).

42434781 is a wasteful number, since it uses less digits than its factorization.

42434781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14144930.

The product of its digits is 21504, while the sum is 33.

The square root of 42434781 is about 6514.1984157684. The cubic root of 42434781 is about 348.7980018972.

The spelling of 42434781 in words is "forty-two million, four hundred thirty-four thousand, seven hundred eighty-one".