39985797 has 8 divisors (see below), whose sum is σ = 54320544. Its totient is φ = 26154128.

The previous prime is 39985787. The next prime is 39985837. The reversal of 39985797 is 79758993.

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

It is a cyclic number.

It is not a de Polignac number, because 39985797 - 2⁸ = 39985541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39985787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125583 + ... + 125900.

It is an arithmetic number, because the mean of its divisors is an integer number (6790068).

Almost surely, 2^39985797 is an apocalyptic number.

It is an amenable number.

39985797 is a deficient number, since it is larger than the sum of its proper divisors (14334747).

39985797 is a wasteful number, since it uses less digits than its factorization.

39985797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251539.

The product of its digits is 4286520, while the sum is 57.

The square root of 39985797 is about 6323.4323749053. The cubic root of 39985797 is about 341.9547065629.

The spelling of 39985797 in words is "thirty-nine million, nine hundred eighty-five thousand, seven hundred ninety-seven".