38638091 has 4 divisors (see below), whose sum is σ = 40318032. Its totient is φ = 36958152.

The previous prime is 38638087. The next prime is 38638133. The reversal of 38638091 is 19083683.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19083683 = 97 ⋅196739.

It is a cyclic number.

It is not a de Polignac number, because 38638091 - 2² = 38638087 is a prime.

It is a super-2 number, since 2×38638091² = 2985804152248562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38638051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 839936 + ... + 839981.

It is an arithmetic number, because the mean of its divisors is an integer number (10079508).

Almost surely, 2^38638091 is an apocalyptic number.

38638091 is a deficient number, since it is larger than the sum of its proper divisors (1679941).

38638091 is a wasteful number, since it uses less digits than its factorization.

38638091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1679940.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 38638091 is about 6215.9545526009. The cubic root of 38638091 is about 338.0688998577.

The spelling of 38638091 in words is "thirty-eight million, six hundred thirty-eight thousand, ninety-one".