42549739 has 4 divisors (see below), whose sum is σ = 42571656. Its totient is φ = 42527824.

The previous prime is 42549737. The next prime is 42549751. The reversal of 42549739 is 93794524.

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 42549739 - 2¹ = 42549737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42549695 and 42549704.

It is not an unprimeable number, because it can be changed into a prime (42549733) 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, 7729 + ... + 12034.

It is an arithmetic number, because the mean of its divisors is an integer number (10642914).

Almost surely, 2^42549739 is an apocalyptic number.

42549739 is a deficient number, since it is larger than the sum of its proper divisors (21917).

42549739 is a wasteful number, since it uses less digits than its factorization.

42549739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21916.

The product of its digits is 272160, while the sum is 43.

The square root of 42549739 is about 6523.0160968681. The cubic root of 42549739 is about 349.1126884646.

The spelling of 42549739 in words is "forty-two million, five hundred forty-nine thousand, seven hundred thirty-nine".