42749139 has 8 divisors (see below), whose sum is σ = 57030912. Its totient is φ = 28483400.

The previous prime is 42749117. The next prime is 42749141. The reversal of 42749139 is 93194724.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42749139 - 2¹¹ = 42747091 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42749097 and 42749106.

It is not an unprimeable number, because it can be changed into a prime (42749039) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5314 + ... + 10664.

It is an arithmetic number, because the mean of its divisors is an integer number (7128864).

Almost surely, 2^42749139 is an apocalyptic number.

42749139 is a deficient number, since it is larger than the sum of its proper divisors (14281773).

42749139 is a wasteful number, since it uses less digits than its factorization.

42749139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8017.

The product of its digits is 54432, while the sum is 39.

The square root of 42749139 is about 6538.2825726639. The cubic root of 42749139 is about 349.6571854214.

The spelling of 42749139 in words is "forty-two million, seven hundred forty-nine thousand, one hundred thirty-nine".