39720640 has 112 divisors (see below), whose sum is σ = 102412800. Its totient is φ = 14625792.

The previous prime is 39720623. The next prime is 39720643. The reversal of 39720640 is 4602793.

It is not an unprimeable number, because it can be changed into a prime (39720643) 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 15 ways as a sum of consecutive naturals, for example, 285691 + ... + 285829.

It is an arithmetic number, because the mean of its divisors is an integer number (914400).

Almost surely, 2^39720640 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 39720640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51206400).

39720640 is an abundant number, since it is smaller than the sum of its proper divisors (62692160).

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

39720640 is a wasteful number, since it uses less digits than its factorization.

39720640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222 (or 212 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 39720640 is about 6302.4312768962. The cubic root of 39720640 is about 341.1971638378.

The spelling of 39720640 in words is "thirty-nine million, seven hundred twenty thousand, six hundred forty".