39942880 has 48 divisors (see below), whose sum is σ = 97421184. Its totient is φ = 15459840.

The previous prime is 39942871. The next prime is 39942887. The reversal of 39942880 is 8824993.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39942887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 934 + ... + 8986.

It is an arithmetic number, because the mean of its divisors is an integer number (2029608).

Almost surely, 2^39942880 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 39942880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48710592).

39942880 is an abundant number, since it is smaller than the sum of its proper divisors (57478304).

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

39942880 is a wasteful number, since it uses less digits than its factorization.

39942880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8099 (or 8091 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 39942880 is about 6320.0379745695. The cubic root of 39942880 is about 341.8323220758.

The spelling of 39942880 in words is "thirty-nine million, nine hundred forty-two thousand, eight hundred eighty".