38391421 has 4 divisors (see below), whose sum is σ = 38406844. Its totient is φ = 38376000.

The previous prime is 38391407. The next prime is 38391427. The reversal of 38391421 is 12419383.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4040100 + 34351321 = 2010^2 + 5861^2 .

It is a cyclic number.

It is not a de Polignac number, because 38391421 - 2⁹ = 38390909 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 (38391427) 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, 3030 + ... + 9271.

It is an arithmetic number, because the mean of its divisors is an integer number (9601711).

Almost surely, 2^38391421 is an apocalyptic number.

It is an amenable number.

38391421 is a deficient number, since it is larger than the sum of its proper divisors (15423).

38391421 is a wasteful number, since it uses less digits than its factorization.

38391421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15422.

The product of its digits is 5184, while the sum is 31.

The square root of 38391421 is about 6196.0811001794. The cubic root of 38391421 is about 337.3479399132.

The spelling of 38391421 in words is "thirty-eight million, three hundred ninety-one thousand, four hundred twenty-one".