38641921 has 4 divisors (see below), whose sum is σ = 38879152. Its totient is φ = 38404692.

The previous prime is 38641919. The next prime is 38641927. The reversal of 38641921 is 12914683.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12914683 = 79 ⋅163477.

It is a cyclic number.

It is not a de Polignac number, because 38641921 - 2¹ = 38641919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38641927) 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, 118371 + ... + 118696.

It is an arithmetic number, because the mean of its divisors is an integer number (9719788).

Almost surely, 2^38641921 is an apocalyptic number.

It is an amenable number.

38641921 is a deficient number, since it is larger than the sum of its proper divisors (237231).

38641921 is a wasteful number, since it uses less digits than its factorization.

38641921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237230.

The product of its digits is 10368, while the sum is 34.

The square root of 38641921 is about 6216.2626231523. The cubic root of 38641921 is about 338.0800698463.

The spelling of 38641921 in words is "thirty-eight million, six hundred forty-one thousand, nine hundred twenty-one".