38891693 has 4 divisors (see below), whose sum is σ = 38912448. Its totient is φ = 38870940.

The previous prime is 38891687. The next prime is 38891707. The reversal of 38891693 is 39619883.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39619883 = 19 ⋅2085257.

It is a cyclic number.

It is not a de Polignac number, because 38891693 - 2¹⁰ = 38890669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38891603) 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, 7253 + ... + 11418.

It is an arithmetic number, because the mean of its divisors is an integer number (9728112).

Almost surely, 2^38891693 is an apocalyptic number.

It is an amenable number.

38891693 is a deficient number, since it is larger than the sum of its proper divisors (20755).

38891693 is a wasteful number, since it uses less digits than its factorization.

38891693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20754.

The product of its digits is 279936, while the sum is 47.

The square root of 38891693 is about 6236.3204696359. The cubic root of 38891693 is about 338.8069285187.

The spelling of 38891693 in words is "thirty-eight million, eight hundred ninety-one thousand, six hundred ninety-three".