42639744 has 128 divisors (see below), whose sum is σ = 134150400. Its totient is φ = 11741184.

The previous prime is 42639733. The next prime is 42639761. The reversal of 42639744 is 44793624.

It is a tau number, because it is divible by the number of its divisors (128).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77679 + ... + 78225.

It is an arithmetic number, because the mean of its divisors is an integer number (1048050).

Almost surely, 2^42639744 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42639744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67075200).

42639744 is an abundant number, since it is smaller than the sum of its proper divisors (91510656).

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

42639744 is a wasteful number, since it uses less digits than its factorization.

42639744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600 (or 588 counting only the distinct ones).

The product of its digits is 145152, while the sum is 39.

The square root of 42639744 is about 6529.9114848518. The cubic root of 42639744 is about 349.3586731937.

The spelling of 42639744 in words is "forty-two million, six hundred thirty-nine thousand, seven hundred forty-four".