39965217 has 16 divisors (see below), whose sum is σ = 54975360. Its totient is φ = 25824816.

The previous prime is 39965209. The next prime is 39965221. The reversal of 39965217 is 71256993.

It is not a de Polignac number, because 39965217 - 2³ = 39965209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (39965257) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151828 + ... + 152090.

It is an arithmetic number, because the mean of its divisors is an integer number (3435960).

Almost surely, 2^39965217 is an apocalyptic number.

39965217 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

It is an amenable number.

39965217 is a deficient number, since it is larger than the sum of its proper divisors (15010143).

39965217 is an frugal number, since it uses more digits than its factorization.

39965217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377 (or 303 counting only the distinct ones).

The product of its digits is 102060, while the sum is 42.

The square root of 39965217 is about 6321.8048846829. The cubic root of 39965217 is about 341.8960304322.

The spelling of 39965217 in words is "thirty-nine million, nine hundred sixty-five thousand, two hundred seventeen".