38943421 has 4 divisors (see below), whose sum is σ = 42483744. Its totient is φ = 35403100.

The previous prime is 38943397. The next prime is 38943449. The reversal of 38943421 is 12434983.

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 a cyclic number.

It is not a de Polignac number, because 38943421 - 2⁹ = 38942909 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 (38943221) 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, 1770145 + ... + 1770166.

It is an arithmetic number, because the mean of its divisors is an integer number (10620936).

Almost surely, 2^38943421 is an apocalyptic number.

It is an amenable number.

38943421 is a deficient number, since it is larger than the sum of its proper divisors (3540323).

38943421 is a wasteful number, since it uses less digits than its factorization.

38943421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3540322.

The product of its digits is 20736, while the sum is 34.

The square root of 38943421 is about 6240.4664088512. The cubic root of 38943421 is about 338.9570723249.

The spelling of 38943421 in words is "thirty-eight million, nine hundred forty-three thousand, four hundred twenty-one".