39973823 has 4 divisors (see below), whose sum is σ = 40011168. Its totient is φ = 39936480.

The previous prime is 39973807. The next prime is 39973831. The reversal of 39973823 is 32837993.

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

It is a cyclic number.

It is not a de Polignac number, because 39973823 - 2⁴ = 39973807 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39973873) 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, 17018 + ... + 19223.

It is an arithmetic number, because the mean of its divisors is an integer number (10002792).

Almost surely, 2^39973823 is an apocalyptic number.

39973823 is a deficient number, since it is larger than the sum of its proper divisors (37345).

39973823 is a wasteful number, since it uses less digits than its factorization.

39973823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37344.

The product of its digits is 244944, while the sum is 44.

The square root of 39973823 is about 6322.4855080894. The cubic root of 39973823 is about 341.9205696547.

The spelling of 39973823 in words is "thirty-nine million, nine hundred seventy-three thousand, eight hundred twenty-three".