38722561 has 4 divisors (see below), whose sum is σ = 39212800. Its totient is φ = 38232324.

The previous prime is 38722559. The next prime is 38722601. The reversal of 38722561 is 16522783.

It is a happy number.

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: 16522783 = 31 ⋅532993.

It is a cyclic number.

It is not a de Polignac number, because 38722561 - 2¹ = 38722559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38762561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 245001 + ... + 245158.

It is an arithmetic number, because the mean of its divisors is an integer number (9803200).

Almost surely, 2^38722561 is an apocalyptic number.

It is an amenable number.

38722561 is a deficient number, since it is larger than the sum of its proper divisors (490239).

38722561 is an equidigital number, since it uses as much as digits as its factorization.

38722561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490238.

The product of its digits is 20160, while the sum is 34.

The square root of 38722561 is about 6222.7454551829. The cubic root of 38722561 is about 338.3150808880.

The spelling of 38722561 in words is "thirty-eight million, seven hundred twenty-two thousand, five hundred sixty-one".