38668729 has 4 divisors (see below), whose sum is σ = 42184080. Its totient is φ = 35153380.

The previous prime is 38668723. The next prime is 38668753. The reversal of 38668729 is 92786683.

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 38668729 - 2¹³ = 38660537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38668723) 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, 1757659 + ... + 1757680.

It is an arithmetic number, because the mean of its divisors is an integer number (10546020).

Almost surely, 2^38668729 is an apocalyptic number.

It is an amenable number.

38668729 is a deficient number, since it is larger than the sum of its proper divisors (3515351).

38668729 is a wasteful number, since it uses less digits than its factorization.

38668729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3515350.

The product of its digits is 870912, while the sum is 49.

The square root of 38668729 is about 6218.4185288544. The cubic root of 38668729 is about 338.1582332777.

The spelling of 38668729 in words is "thirty-eight million, six hundred sixty-eight thousand, seven hundred twenty-nine".