38920561 has 4 divisors (see below), whose sum is σ = 39033072. Its totient is φ = 38808052.

The previous prime is 38920549. The next prime is 38920591. The reversal of 38920561 is 16502983.

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 38920561 - 2⁵ = 38920529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38920591) 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, 55735 + ... + 56428.

It is an arithmetic number, because the mean of its divisors is an integer number (9758268).

Almost surely, 2^38920561 is an apocalyptic number.

It is an amenable number.

38920561 is a deficient number, since it is larger than the sum of its proper divisors (112511).

38920561 is a wasteful number, since it uses less digits than its factorization.

38920561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112510.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 38920561 is about 6238.6345461166. The cubic root of 38920561 is about 338.8907361282.

The spelling of 38920561 in words is "thirty-eight million, nine hundred twenty thousand, five hundred sixty-one".