38644621 has 4 divisors (see below), whose sum is σ = 40917852. Its totient is φ = 36371392.

The previous prime is 38644609. The next prime is 38644633. The reversal of 38644621 is 12644683.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12644683 = 31 ⋅407893.

It is an interprime number because it is at equal distance from previous prime (38644609) and next prime (38644633).

It can be written as a sum of positive squares in 2 ways, for example, as 16695396 + 21949225 = 4086^2 + 4685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38644621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38642621) 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, 1136590 + ... + 1136623.

It is an arithmetic number, because the mean of its divisors is an integer number (10229463).

Almost surely, 2^38644621 is an apocalyptic number.

It is an amenable number.

38644621 is a deficient number, since it is larger than the sum of its proper divisors (2273231).

38644621 is a wasteful number, since it uses less digits than its factorization.

38644621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2273230.

The product of its digits is 27648, while the sum is 34.

The square root of 38644621 is about 6216.4797916506. The cubic root of 38644621 is about 338.0879438072.

The spelling of 38644621 in words is "thirty-eight million, six hundred forty-four thousand, six hundred twenty-one".