39949668 has 72 divisors (see below), whose sum is σ = 111646080. Its totient is φ = 11943360.

The previous prime is 39949661. The next prime is 39949673. The reversal of 39949668 is 86694993.

It is a happy number.

39949668 is a `hidden beast` number, since 3 + 99 + 496 + 68 = 666.

It is not an unprimeable number, because it can be changed into a prime (39949661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30646 + ... + 31922.

It is an arithmetic number, because the mean of its divisors is an integer number (1550640).

Almost surely, 2^39949668 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 39949668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55823040).

39949668 is an abundant number, since it is smaller than the sum of its proper divisors (71696412).

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

39949668 is a wasteful number, since it uses less digits than its factorization.

39949668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1377 (or 1372 counting only the distinct ones).

The product of its digits is 2519424, while the sum is 54.

The square root of 39949668 is about 6320.5749738453. The cubic root of 39949668 is about 341.8516849457.

The spelling of 39949668 in words is "thirty-nine million, nine hundred forty-nine thousand, six hundred sixty-eight".