38729609 has 4 divisors (see below), whose sum is σ = 38926404. Its totient is φ = 38532816.

The previous prime is 38729599. The next prime is 38729617. The reversal of 38729609 is 90692783.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37552384 + 1177225 = 6128^2 + 1085^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38729609 is a prime.

It is a super-2 number, since 2×38729609² = 2999965226585762, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 38729609.

It is not an unprimeable number, because it can be changed into a prime (38729629) 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, 98102 + ... + 98495.

It is an arithmetic number, because the mean of its divisors is an integer number (9731601).

Almost surely, 2^38729609 is an apocalyptic number.

It is an amenable number.

38729609 is a deficient number, since it is larger than the sum of its proper divisors (196795).

38729609 is a wasteful number, since it uses less digits than its factorization.

38729609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196794.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 38729609 is about 6223.3117389377. The cubic root of 38729609 is about 338.3356055294.

The spelling of 38729609 in words is "thirty-eight million, seven hundred twenty-nine thousand, six hundred nine".