38943921 has 4 divisors (see below), whose sum is σ = 51925232. Its totient is φ = 25962612.

The previous prime is 38943887. The next prime is 38943941. The reversal of 38943921 is 12934983.

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 38943921 - 2¹¹ = 38941873 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 38943921.

It is not an unprimeable number, because it can be changed into a prime (38943941) 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, 6490651 + ... + 6490656.

It is an arithmetic number, because the mean of its divisors is an integer number (12981308).

Almost surely, 2^38943921 is an apocalyptic number.

It is an amenable number.

38943921 is a deficient number, since it is larger than the sum of its proper divisors (12981311).

38943921 is a wasteful number, since it uses less digits than its factorization.

38943921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12981310.

The product of its digits is 46656, while the sum is 39.

The square root of 38943921 is about 6240.5064698308. The cubic root of 38943921 is about 338.9585229577.

The spelling of 38943921 in words is "thirty-eight million, nine hundred forty-three thousand, nine hundred twenty-one".