38646561 has 4 divisors (see below), whose sum is σ = 51528752. Its totient is φ = 25764372.

The previous prime is 38646557. The next prime is 38646599. The reversal of 38646561 is 16564683.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16564683 = 3 ⋅5521561.

It is not a de Polignac number, because 38646561 - 2² = 38646557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (38646511) 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, 6441091 + ... + 6441096.

It is an arithmetic number, because the mean of its divisors is an integer number (12882188).

Almost surely, 2^38646561 is an apocalyptic number.

It is an amenable number.

38646561 is a deficient number, since it is larger than the sum of its proper divisors (12882191).

38646561 is a wasteful number, since it uses less digits than its factorization.

38646561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12882190.

The product of its digits is 103680, while the sum is 39.

The square root of 38646561 is about 6216.6358265544. The cubic root of 38646561 is about 338.0936011675.

The spelling of 38646561 in words is "thirty-eight million, six hundred forty-six thousand, five hundred sixty-one".