39891963 has 16 divisors (see below), whose sum is σ = 56209280. Its totient is φ = 25095744.

The previous prime is 39891961. The next prime is 39891983. The reversal of 39891963 is 36919893.

It is a happy number.

It is not a de Polignac number, because 39891963 - 2¹ = 39891961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39891961) 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, 14895 + ... + 17367.

It is an arithmetic number, because the mean of its divisors is an integer number (3513080).

Almost surely, 2^39891963 is an apocalyptic number.

39891963 is a deficient number, since it is larger than the sum of its proper divisors (16317317).

39891963 is a wasteful number, since it uses less digits than its factorization.

39891963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2778.

The product of its digits is 314928, while the sum is 48.

The square root of 39891963 is about 6316.0084705453. The cubic root of 39891963 is about 341.6870105938.

The spelling of 39891963 in words is "thirty-nine million, eight hundred ninety-one thousand, nine hundred sixty-three".