38128693 has 4 divisors (see below), whose sum is σ = 38142028. Its totient is φ = 38115360.

The previous prime is 38128679. The next prime is 38128697. The reversal of 38128693 is 39682183.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 39682183 = 839 ⋅47297.

It can be written as a sum of positive squares in 2 ways, for example, as 9474084 + 28654609 = 3078^2 + 5353^2 .

It is a cyclic number.

It is not a de Polignac number, because 38128693 - 2¹³ = 38120501 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 (38128697) 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, 438 + ... + 8743.

It is an arithmetic number, because the mean of its divisors is an integer number (9535507).

Almost surely, 2^38128693 is an apocalyptic number.

It is an amenable number.

38128693 is a deficient number, since it is larger than the sum of its proper divisors (13335).

38128693 is an equidigital number, since it uses as much as digits as its factorization.

38128693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13334.

The product of its digits is 62208, while the sum is 40.

The square root of 38128693 is about 6174.8435607714. The cubic root of 38128693 is about 336.5766417247.

The spelling of 38128693 in words is "thirty-eight million, one hundred twenty-eight thousand, six hundred ninety-three".