42744138 has 8 divisors (see below), whose sum is σ = 85488288. Its totient is φ = 14248044.

The previous prime is 42744131. The next prime is 42744157. The reversal of 42744138 is 83144724.

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

42744138 is an admirable number.

It is a super-2 number, since 2×42744138² = 3654122666726088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42744099 and 42744108.

It is not an unprimeable number, because it can be changed into a prime (42744131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3562006 + ... + 3562017.

It is an arithmetic number, because the mean of its divisors is an integer number (10686036).

Almost surely, 2^42744138 is an apocalyptic number.

42744138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42744138 is a wasteful number, since it uses less digits than its factorization.

42744138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7124028.

The product of its digits is 21504, while the sum is 33.

The square root of 42744138 is about 6537.9001215987. The cubic root of 42744138 is about 349.6435500296.

The spelling of 42744138 in words is "forty-two million, seven hundred forty-four thousand, one hundred thirty-eight".