39981396 has 192 divisors, whose sum is σ = 126443520. Its totient is φ = 9538560.

The previous prime is 39981367. The next prime is 39981397. The reversal of 39981396 is 69318993.

It is a happy number.

It is a super-2 number, since 2×39981396² = 3197024052217632, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39981397) 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, 850645 + ... + 850691.

It is an arithmetic number, because the mean of its divisors is an integer number (658560).

Almost surely, 2^39981396 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 39981396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63221760).

39981396 is an abundant number, since it is smaller than the sum of its proper divisors (86462124).

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

39981396 is a wasteful number, since it uses less digits than its factorization.

39981396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134 (or 132 counting only the distinct ones).

The product of its digits is 314928, while the sum is 48.

The square root of 39981396 is about 6323.0843739428. The cubic root of 39981396 is about 341.9421604591.

The spelling of 39981396 in words is "thirty-nine million, nine hundred eighty-one thousand, three hundred ninety-six".