39881973 has 4 divisors (see below), whose sum is σ = 53175968. Its totient is φ = 26587980.

The previous prime is 39881957. The next prime is 39882043. The reversal of 39881973 is 37918893.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 39881973 - 2⁴ = 39881957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39881573) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6646993 + ... + 6646998.

It is an arithmetic number, because the mean of its divisors is an integer number (13293992).

Almost surely, 2^39881973 is an apocalyptic number.

It is an amenable number.

39881973 is a deficient number, since it is larger than the sum of its proper divisors (13293995).

39881973 is a wasteful number, since it uses less digits than its factorization.

39881973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13293994.

The product of its digits is 326592, while the sum is 48.

The square root of 39881973 is about 6315.2175734491. The cubic root of 39881973 is about 341.6584857318.

The spelling of 39881973 in words is "thirty-nine million, eight hundred eighty-one thousand, nine hundred seventy-three".