39985520 has 20 divisors (see below), whose sum is σ = 92966520. Its totient is φ = 15994176.

The previous prime is 39985511. The next prime is 39985529. The reversal of 39985520 is 2558993.

It is an interprime number because it is at equal distance from previous prime (39985511) and next prime (39985529).

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39985529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 249830 + ... + 249989.

It is an arithmetic number, because the mean of its divisors is an integer number (4648326).

Almost surely, 2^39985520 is an apocalyptic number.

It is an amenable number.

39985520 is an abundant number, since it is smaller than the sum of its proper divisors (52981000).

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

39985520 is a wasteful number, since it uses less digits than its factorization.

39985520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499832 (or 499826 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 41.

The square root of 39985520 is about 6323.4104722056. The cubic root of 39985520 is about 341.9539169352.

The spelling of 39985520 in words is "thirty-nine million, nine hundred eighty-five thousand, five hundred twenty".