39997742 has 8 divisors (see below), whose sum is σ = 60328632. Its totient is φ = 19888200.

The previous prime is 39997739. The next prime is 39997801. The reversal of 39997742 is 24779993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 54884 + ... + 55607.

It is an arithmetic number, because the mean of its divisors is an integer number (7541079).

Almost surely, 2^39997742 is an apocalyptic number.

39997742 is a deficient number, since it is larger than the sum of its proper divisors (20330890).

39997742 is a wasteful number, since it uses less digits than its factorization.

39997742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110674.

The product of its digits is 857304, while the sum is 50.

The square root of 39997742 is about 6324.3768072435. The cubic root of 39997742 is about 341.9887540048.

The spelling of 39997742 in words is "thirty-nine million, nine hundred ninety-seven thousand, seven hundred forty-two".