39941640 has 128 divisors (see below), whose sum is σ = 137548800. Its totient is φ = 10298880.

The previous prime is 39941623. The next prime is 39941647. The reversal of 39941640 is 4614993.

39941640 is a `hidden beast` number, since 3 + 9 + 9 + 4 + 1 + 640 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 39941595 and 39941604.

It is not an unprimeable number, because it can be changed into a prime (39941647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32884 + ... + 34076.

It is an arithmetic number, because the mean of its divisors is an integer number (1074600).

Almost surely, 2^39941640 is an apocalyptic number.

39941640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39941640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68774400).

39941640 is an abundant number, since it is smaller than the sum of its proper divisors (97607160).

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

39941640 is a wasteful number, since it uses less digits than its factorization.

39941640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244 (or 1234 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 39941640 is about 6319.9398731317. The cubic root of 39941640 is about 341.8287847206.

The spelling of 39941640 in words is "thirty-nine million, nine hundred forty-one thousand, six hundred forty".