38729691 has 64 divisors (see below), whose sum is σ = 77091840. Its totient is φ = 18558720.

The previous prime is 38729687. The next prime is 38729701. The reversal of 38729691 is 19692783.

It is not a de Polignac number, because 38729691 - 2² = 38729687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (38729191) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 26311 + ... + 27743.

It is an arithmetic number, because the mean of its divisors is an integer number (1204560).

Almost surely, 2^38729691 is an apocalyptic number.

38729691 is a deficient number, since it is larger than the sum of its proper divisors (38362149).

38729691 is a wasteful number, since it uses less digits than its factorization.

38729691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1473 (or 1467 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 38729691 is about 6223.3183270664. The cubic root of 38729691 is about 338.3358443088.

The spelling of 38729691 in words is "thirty-eight million, seven hundred twenty-nine thousand, six hundred ninety-one".