42249439 has 4 divisors (see below), whose sum is σ = 42268720. Its totient is φ = 42230160.

The previous prime is 42249419. The next prime is 42249461. The reversal of 42249439 is 93494224.

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 42249439 - 2¹³ = 42241247 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42249398 and 42249407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42249419) 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, 5859 + ... + 10900.

It is an arithmetic number, because the mean of its divisors is an integer number (10567180).

Almost surely, 2^42249439 is an apocalyptic number.

42249439 is a deficient number, since it is larger than the sum of its proper divisors (19281).

42249439 is a wasteful number, since it uses less digits than its factorization.

42249439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19280.

The product of its digits is 62208, while the sum is 37.

The square root of 42249439 is about 6499.9568460106. The cubic root of 42249439 is about 348.2894468390.

The spelling of 42249439 in words is "forty-two million, two hundred forty-nine thousand, four hundred thirty-nine".