38729561 has 12 divisors (see below), whose sum is σ = 42371820. Its totient is φ = 35380800.

The previous prime is 38729533. The next prime is 38729563. The reversal of 38729561 is 16592783.

It can be written as a sum of positive squares in 6 ways, for example, as 5494336 + 33235225 = 2344^2 + 5765^2 .

It is not a de Polignac number, because 38729561 - 2¹⁰ = 38728537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38729563) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15935 + ... + 18203.

It is an arithmetic number, because the mean of its divisors is an integer number (3530985).

Almost surely, 2^38729561 is an apocalyptic number.

It is an amenable number.

38729561 is a deficient number, since it is larger than the sum of its proper divisors (3642259).

38729561 is a wasteful number, since it uses less digits than its factorization.

38729561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2396 (or 2383 counting only the distinct ones).

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

The square root of 38729561 is about 6223.3078824689. The cubic root of 38729561 is about 338.3354657559.

The spelling of 38729561 in words is "thirty-eight million, seven hundred twenty-nine thousand, five hundred sixty-one".