38921945 has 4 divisors (see below), whose sum is σ = 46706340. Its totient is φ = 31137552.

The previous prime is 38921941. The next prime is 38921947. The reversal of 38921945 is 54912983.

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 30946969 + 7974976 = 5563^2 + 2824^2 .

It is a cyclic number.

It is not a de Polignac number, because 38921945 - 2² = 38921941 is a prime.

It is not an unprimeable number, because it can be changed into a prime (38921941) 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, 3892190 + ... + 3892199.

It is an arithmetic number, because the mean of its divisors is an integer number (11676585).

Almost surely, 2^38921945 is an apocalyptic number.

It is an amenable number.

38921945 is a deficient number, since it is larger than the sum of its proper divisors (7784395).

38921945 is an equidigital number, since it uses as much as digits as its factorization.

38921945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7784394.

The product of its digits is 77760, while the sum is 41.

The square root of 38921945 is about 6238.7454668387. The cubic root of 38921945 is about 338.8947530214.

The spelling of 38921945 in words is "thirty-eight million, nine hundred twenty-one thousand, nine hundred forty-five".