38643609 has 4 divisors (see below), whose sum is σ = 51524816. Its totient is φ = 25762404.

The previous prime is 38643599. The next prime is 38643623. The reversal of 38643609 is 90634683.

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.

It is not a de Polignac number, because 38643609 - 2⁴ = 38643593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38643629) 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, 6440599 + ... + 6440604.

It is an arithmetic number, because the mean of its divisors is an integer number (12881204).

Almost surely, 2^38643609 is an apocalyptic number.

It is an amenable number.

38643609 is a deficient number, since it is larger than the sum of its proper divisors (12881207).

38643609 is a wasteful number, since it uses less digits than its factorization.

38643609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12881206.

The product of its (nonzero) digits is 93312, while the sum is 39.

The square root of 38643609 is about 6216.3983945690. The cubic root of 38643609 is about 338.0849925730.

The spelling of 38643609 in words is "thirty-eight million, six hundred forty-three thousand, six hundred nine".