39991380 has 192 divisors, whose sum is σ = 135475200. Its totient is φ = 8686080.

The previous prime is 39991373. The next prime is 39991381. The reversal of 39991380 is 8319993.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39991381) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 506181 + ... + 506259.

It is an arithmetic number, because the mean of its divisors is an integer number (705600).

Almost surely, 2^39991380 is an apocalyptic number.

39991380 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39991380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67737600).

39991380 is an abundant number, since it is smaller than the sum of its proper divisors (95483820).

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

39991380 is a wasteful number, since it uses less digits than its factorization.

39991380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174 (or 172 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 39991380 is about 6323.8738127828. The cubic root of 39991380 is about 341.9706209160.

It can be divided in two parts, 399913 and 80, that added together give a palindrome (399993).

The spelling of 39991380 in words is "thirty-nine million, nine hundred ninety-one thousand, three hundred eighty".