38006643 has 4 divisors (see below), whose sum is σ = 50675528. Its totient is φ = 25337760.

The previous prime is 38006641. The next prime is 38006653. The reversal of 38006643 is 34660083.

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

It is not a de Polignac number, because 38006643 - 2¹ = 38006641 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 38006643.

It is not an unprimeable number, because it can be changed into a prime (38006641) 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, 6334438 + ... + 6334443.

It is an arithmetic number, because the mean of its divisors is an integer number (12668882).

Almost surely, 2^38006643 is an apocalyptic number.

38006643 is a deficient number, since it is larger than the sum of its proper divisors (12668885).

38006643 is a wasteful number, since it uses less digits than its factorization.

38006643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12668884.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 38006643 is about 6164.9527978728. The cubic root of 38006643 is about 336.2171304179.

The spelling of 38006643 in words is "thirty-eight million, six thousand, six hundred forty-three".