38691089 has 4 divisors (see below), whose sum is σ = 38703540. Its totient is φ = 38678640.

The previous prime is 38691073. The next prime is 38691091. The reversal of 38691089 is 98019683.

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: 98019683 = 3539 ⋅27697.

It can be written as a sum of positive squares in 2 ways, for example, as 1481089 + 37210000 = 1217^2 + 6100^2 .

It is a cyclic number.

It is not a de Polignac number, because 38691089 - 2⁴ = 38691073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38693089) 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, 2747 + ... + 9215.

It is an arithmetic number, because the mean of its divisors is an integer number (9675885).

Almost surely, 2^38691089 is an apocalyptic number.

It is an amenable number.

38691089 is a deficient number, since it is larger than the sum of its proper divisors (12451).

38691089 is an equidigital number, since it uses as much as digits as its factorization.

38691089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12450.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 38691089 is about 6220.2161538004. The cubic root of 38691089 is about 338.2234001567.

The spelling of 38691089 in words is "thirty-eight million, six hundred ninety-one thousand, eighty-nine".