39781368 has 80 divisors (see below), whose sum is σ = 121575960. Its totient is φ = 12052800.

The previous prime is 39781337. The next prime is 39781369. The reversal of 39781368 is 86318793.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39781369) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4338 + ... + 9918.

Almost surely, 2^39781368 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 39781368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60787980).

39781368 is an abundant number, since it is smaller than the sum of its proper divisors (81794592).

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

39781368 is a wasteful number, since it uses less digits than its factorization.

39781368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5610 (or 5597 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 39781368 is about 6307.2472600969. The cubic root of 39781368 is about 341.3709582074.

The spelling of 39781368 in words is "thirty-nine million, seven hundred eighty-one thousand, three hundred sixty-eight".