3909825823 has 4 divisors (see below), whose sum is σ = 3922561720. Its totient is φ = 3897089928.

The previous prime is 3909825817. The next prime is 3909825827. The reversal of 3909825823 is 3285289093.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-3909825823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3909825827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6367488 + ... + 6368101.

It is an arithmetic number, because the mean of its divisors is an integer number (980640430).

Almost surely, 2^3909825823 is an apocalyptic number.

3909825823 is a deficient number, since it is larger than the sum of its proper divisors (12735897).

3909825823 is a wasteful number, since it uses less digits than its factorization.

3909825823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12735896.

The product of its (nonzero) digits is 933120, while the sum is 49.

The square root of 3909825823 is about 62528.6000403016. The cubic root of 3909825823 is about 1575.3817263043.

The spelling of 3909825823 in words is "three billion, nine hundred nine million, eight hundred twenty-five thousand, eight hundred twenty-three".