38891971 has 8 divisors (see below), whose sum is σ = 41482800. Its totient is φ = 36334848.

The previous prime is 38891939. The next prime is 38891977. The reversal of 38891971 is 17919883.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 38891971 - 2⁵ = 38891939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38891977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6021 + ... + 10678.

It is an arithmetic number, because the mean of its divisors is an integer number (5185350).

Almost surely, 2^38891971 is an apocalyptic number.

38891971 is a deficient number, since it is larger than the sum of its proper divisors (2590829).

38891971 is a wasteful number, since it uses less digits than its factorization.

38891971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16853.

The product of its digits is 108864, while the sum is 46.

The square root of 38891971 is about 6236.3427583801. The cubic root of 38891971 is about 338.8077357871.

The spelling of 38891971 in words is "thirty-eight million, eight hundred ninety-one thousand, nine hundred seventy-one".