39947748 has 12 divisors (see below), whose sum is σ = 93211440. Its totient is φ = 13315912.

The previous prime is 39947689. The next prime is 39947749. The reversal of 39947748 is 84774993.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 39947748.

It is not an unprimeable number, because it can be changed into a prime (39947749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1664478 + ... + 1664501.

It is an arithmetic number, because the mean of its divisors is an integer number (7767620).

Almost surely, 2^39947748 is an apocalyptic number.

It is an amenable number.

39947748 is an abundant number, since it is smaller than the sum of its proper divisors (53263692).

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

39947748 is a wasteful number, since it uses less digits than its factorization.

39947748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3328986 (or 3328984 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 51.

The square root of 39947748 is about 6320.4230871042. The cubic root of 39947748 is about 341.8462083399.

The spelling of 39947748 in words is "thirty-nine million, nine hundred forty-seven thousand, seven hundred forty-eight".