42744139 has 4 divisors (see below), whose sum is σ = 43899424. Its totient is φ = 41588856.

The previous prime is 42744131. The next prime is 42744157. The reversal of 42744139 is 93144724.

It is a happy number.

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 42744139 - 2³ = 42744131 is a prime.

It is a super-2 number, since 2×42744139² = 3654122837702642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42744131) 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, 577587 + ... + 577660.

It is an arithmetic number, because the mean of its divisors is an integer number (10974856).

Almost surely, 2^42744139 is an apocalyptic number.

42744139 is a deficient number, since it is larger than the sum of its proper divisors (1155285).

42744139 is a wasteful number, since it uses less digits than its factorization.

42744139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1155284.

The product of its digits is 24192, while the sum is 34.

The square root of 42744139 is about 6537.9001980758. The cubic root of 42744139 is about 349.6435527562.

The spelling of 42744139 in words is "forty-two million, seven hundred forty-four thousand, one hundred thirty-nine".