42123340 has 72 divisors (see below), whose sum is σ = 104972112. Its totient is φ = 14152320.

The previous prime is 42123337. The next prime is 42123379. The reversal of 42123340 is 4332124.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51535 + ... + 52345.

It is an arithmetic number, because the mean of its divisors is an integer number (1457946).

Almost surely, 2^42123340 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 42123340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52486056).

42123340 is an abundant number, since it is smaller than the sum of its proper divisors (62848772).

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

42123340 is a wasteful number, since it uses less digits than its factorization.

42123340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 887 (or 878 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 42123340 is about 6490.2496099919. The cubic root of 42123340 is about 347.9425963360.

Adding to 42123340 its reverse (4332124), we get a palindrome (46455464).

The spelling of 42123340 in words is "forty-two million, one hundred twenty-three thousand, three hundred forty".