38766721 has 4 divisors (see below), whose sum is σ = 44304832. Its totient is φ = 33228612.

The previous prime is 38766719. The next prime is 38766731. The reversal of 38766721 is 12766783.

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 38766721 - 2¹ = 38766719 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (38766701) 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, 2769045 + ... + 2769058.

It is an arithmetic number, because the mean of its divisors is an integer number (11076208).

Almost surely, 2^38766721 is an apocalyptic number.

It is an amenable number.

38766721 is a deficient number, since it is larger than the sum of its proper divisors (5538111).

38766721 is an equidigital number, since it uses as much as digits as its factorization.

38766721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5538110.

The product of its digits is 84672, while the sum is 40.

The square root of 38766721 is about 6226.2927171793. The cubic root of 38766721 is about 338.4436391745.

The spelling of 38766721 in words is "thirty-eight million, seven hundred sixty-six thousand, seven hundred twenty-one".