42409908 has 72 divisors (see below), whose sum is σ = 111908160. Its totient is φ = 13530240.

The previous prime is 42409903. The next prime is 42409909. The reversal of 42409908 is 80990424.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42409903) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 86841 + ... + 87327.

It is an arithmetic number, because the mean of its divisors is an integer number (1554280).

Almost surely, 2^42409908 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 42409908, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55954080).

42409908 is an abundant number, since it is smaller than the sum of its proper divisors (69498252).

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

42409908 is a wasteful number, since it uses less digits than its factorization.

42409908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 597 (or 592 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 42409908 is about 6512.2889985012. The cubic root of 42409908 is about 348.7298396640.

The spelling of 42409908 in words is "forty-two million, four hundred nine thousand, nine hundred eight".