38618729 has 2 divisors, whose sum is σ = 38618730. Its totient is φ = 38618728.

The previous prime is 38618719. The next prime is 38618731. The reversal of 38618729 is 92781683.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26543104 + 12075625 = 5152^2 + 3475^2 .

It is a cyclic number.

It is not a de Polignac number, because 38618729 - 2⁸ = 38618473 is a prime.

Together with 38618731, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 38618729.

It is not a weakly prime, because it can be changed into another prime (38618719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19309364 + 19309365.

It is an arithmetic number, because the mean of its divisors is an integer number (19309365).

Almost surely, 2^38618729 is an apocalyptic number.

It is an amenable number.

38618729 is a deficient number, since it is larger than the sum of its proper divisors (1).

38618729 is an equidigital number, since it uses as much as digits as its factorization.

38618729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 44.

The square root of 38618729 is about 6214.3969136192. The cubic root of 38618729 is about 338.0124203272.

The spelling of 38618729 in words is "thirty-eight million, six hundred eighteen thousand, seven hundred twenty-nine".