38396991 has 4 divisors (see below), whose sum is σ = 51195992. Its totient is φ = 25597992.

The previous prime is 38396989. The next prime is 38397001. The reversal of 38396991 is 19969383.

It is a happy number.

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

It is not a de Polignac number, because 38396991 - 2¹ = 38396989 is a prime.

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 38396991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38396971) 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, 6399496 + ... + 6399501.

It is an arithmetic number, because the mean of its divisors is an integer number (12798998).

Almost surely, 2^38396991 is an apocalyptic number.

38396991 is a deficient number, since it is larger than the sum of its proper divisors (12799001).

38396991 is a wasteful number, since it uses less digits than its factorization.

38396991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12799000.

The product of its digits is 314928, while the sum is 48.

The square root of 38396991 is about 6196.5305615320. The cubic root of 38396991 is about 337.3642537763.

The spelling of 38396991 in words is "thirty-eight million, three hundred ninety-six thousand, nine hundred ninety-one".