42818749 has 4 divisors (see below), whose sum is σ = 42970336. Its totient is φ = 42667164.

The previous prime is 42818747. The next prime is 42818771. The reversal of 42818749 is 94781824.

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 42818749 - 2¹ = 42818747 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 (42818747) 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, 75369 + ... + 75934.

It is an arithmetic number, because the mean of its divisors is an integer number (10742584).

Almost surely, 2^42818749 is an apocalyptic number.

It is an amenable number.

42818749 is a deficient number, since it is larger than the sum of its proper divisors (151587).

42818749 is a wasteful number, since it uses less digits than its factorization.

42818749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151586.

The product of its digits is 129024, while the sum is 43.

The square root of 42818749 is about 6543.6036707612. The cubic root of 42818749 is about 349.8468690668.

The spelling of 42818749 in words is "forty-two million, eight hundred eighteen thousand, seven hundred forty-nine".