38640869 has 4 divisors (see below), whose sum is σ = 39369996. Its totient is φ = 37911744.

The previous prime is 38640857. The next prime is 38640907. The reversal of 38640869 is 96804683.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96804683 = 3137 ⋅30859.

It can be written as a sum of positive squares in 2 ways, for example, as 32638369 + 6002500 = 5713^2 + 2450^2 .

It is a cyclic number.

It is not a de Polignac number, because 38640869 - 2⁴ = 38640853 is a prime.

It is a super-2 number, since 2×38640869² = 2986233514150322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38640769) 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, 364484 + ... + 364589.

It is an arithmetic number, because the mean of its divisors is an integer number (9842499).

Almost surely, 2^38640869 is an apocalyptic number.

It is an amenable number.

38640869 is a deficient number, since it is larger than the sum of its proper divisors (729127).

38640869 is an equidigital number, since it uses as much as digits as its factorization.

38640869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729126.

The product of its (nonzero) digits is 248832, while the sum is 44.

The square root of 38640869 is about 6216.1780058168. The cubic root of 38640869 is about 338.0770018185.

The spelling of 38640869 in words is "thirty-eight million, six hundred forty thousand, eight hundred sixty-nine".