38561729 has 4 divisors (see below), whose sum is σ = 40830084. Its totient is φ = 36293376.

The previous prime is 38561723. The next prime is 38561741. The reversal of 38561729 is 92716583.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92716583 = 103 ⋅900161.

It can be written as a sum of positive squares in 2 ways, for example, as 17032129 + 21529600 = 4127^2 + 4640^2 .

It is a cyclic number.

It is not a de Polignac number, because 38561729 - 2⁴ = 38561713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38561723) 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, 1134152 + ... + 1134185.

It is an arithmetic number, because the mean of its divisors is an integer number (10207521).

Almost surely, 2^38561729 is an apocalyptic number.

It is an amenable number.

38561729 is a deficient number, since it is larger than the sum of its proper divisors (2268355).

38561729 is a wasteful number, since it uses less digits than its factorization.

38561729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2268354.

The product of its digits is 90720, while the sum is 41.

The square root of 38561729 is about 6209.8090952943. The cubic root of 38561729 is about 337.8460399616.

The spelling of 38561729 in words is "thirty-eight million, five hundred sixty-one thousand, seven hundred twenty-nine".