39543940 has 36 divisors (see below), whose sum is σ = 87658956. Its totient is φ = 14982336.

The previous prime is 39543937. The next prime is 39543943. The reversal of 39543940 is 4934593.

It is an interprime number because it is at equal distance from previous prime (39543937) and next prime (39543943).

It can be written as a sum of positive squares in 2 ways, for example, as 31203396 + 8340544 = 5586^2 + 2888^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 39543940.

It is not an unprimeable number, because it can be changed into a prime (39543943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4482 + ... + 9958.

It is an arithmetic number, because the mean of its divisors is an integer number (2434971).

Almost surely, 2^39543940 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 39543940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43829478).

39543940 is an abundant number, since it is smaller than the sum of its proper divisors (48115016).

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

39543940 is a wasteful number, since it uses less digits than its factorization.

39543940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5524 (or 5503 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 37.

The square root of 39543940 is about 6288.3972520826. The cubic root of 39543940 is about 340.6904653793.

The spelling of 39543940 in words is "thirty-nine million, five hundred forty-three thousand, nine hundred forty".