39851997 has 8 divisors (see below), whose sum is σ = 54572256. Its totient is φ = 25849872.

The previous prime is 39851989. The next prime is 39852011. The reversal of 39851997 is 79915893.

It is a happy number.

39851997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 39851997 - 2³ = 39851989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39851947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 179403 + ... + 179624.

It is an arithmetic number, because the mean of its divisors is an integer number (6821532).

Almost surely, 2^39851997 is an apocalyptic number.

39851997 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

It is an amenable number.

39851997 is a deficient number, since it is larger than the sum of its proper divisors (14720259).

39851997 is a wasteful number, since it uses less digits than its factorization.

39851997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359067.

The product of its digits is 612360, while the sum is 51.

The square root of 39851997 is about 6312.8438124192. The cubic root of 39851997 is about 341.5728654128.

The spelling of 39851997 in words is "thirty-nine million, eight hundred fifty-one thousand, nine hundred ninety-seven".