39117920 has 48 divisors (see below), whose sum is σ = 93305520. Its totient is φ = 15496704.

The previous prime is 39117919. The next prime is 39117929. The reversal of 39117920 is 2971193.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39117929) 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, 16319 + ... + 18561.

It is an arithmetic number, because the mean of its divisors is an integer number (1943865).

Almost surely, 2^39117920 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 39117920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46652760).

39117920 is an abundant number, since it is smaller than the sum of its proper divisors (54187600).

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

39117920 is a wasteful number, since it uses less digits than its factorization.

39117920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2367 (or 2359 counting only the distinct ones).

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 39117920 is about 6254.4320285698. The cubic root of 39117920 is about 339.4625881415.

The spelling of 39117920 in words is "thirty-nine million, one hundred seventeen thousand, nine hundred twenty".