39668519 has 6 divisors (see below), whose sum is σ = 43602720. Its totient is φ = 36062180.

The previous prime is 39668513. The next prime is 39668521. The reversal of 39668519 is 91586693.

It is not a de Polignac number, because 39668519 - 2¹² = 39664423 is a prime.

It is a super-2 number, since 2×39668519² = 3147182799306722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39668513) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 163799 + ... + 164040.

It is an arithmetic number, because the mean of its divisors is an integer number (7267120).

Almost surely, 2^39668519 is an apocalyptic number.

39668519 is a deficient number, since it is larger than the sum of its proper divisors (3934201).

39668519 is a wasteful number, since it uses less digits than its factorization.

39668519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327861 (or 327850 counting only the distinct ones).

The product of its digits is 349920, while the sum is 47.

The square root of 39668519 is about 6298.2949279944. The cubic root of 39668519 is about 341.0478600878.

The spelling of 39668519 in words is "thirty-nine million, six hundred sixty-eight thousand, five hundred nineteen".