38918729 has 8 divisors (see below), whose sum is σ = 41420808. Its totient is φ = 36440320.

The previous prime is 38918723. The next prime is 38918753. The reversal of 38918729 is 92781983.

It can be written as a sum of positive squares in 4 ways, for example, as 12673600 + 26245129 = 3560^2 + 5123^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38918729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38918723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2462 + ... + 9159.

It is an arithmetic number, because the mean of its divisors is an integer number (5177601).

Almost surely, 2^38918729 is an apocalyptic number.

It is an amenable number.

38918729 is a deficient number, since it is larger than the sum of its proper divisors (2502079).

38918729 is a wasteful number, since it uses less digits than its factorization.

38918729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11835.

The product of its digits is 217728, while the sum is 47.

The square root of 38918729 is about 6238.4877173879. The cubic root of 38918729 is about 338.8854188224.

The spelling of 38918729 in words is "thirty-eight million, nine hundred eighteen thousand, seven hundred twenty-nine".