38644405 has 8 divisors (see below), whose sum is σ = 46630584. Its totient is φ = 30744000.

The previous prime is 38644399. The next prime is 38644429. The reversal of 38644405 is 50444683.

It can be written as a sum of positive squares in 4 ways, for example, as 2331729 + 36312676 = 1527^2 + 6026^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 38644405 - 2¹⁵ = 38611637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20446 + ... + 22255.

It is an arithmetic number, because the mean of its divisors is an integer number (5828823).

Almost surely, 2^38644405 is an apocalyptic number.

It is an amenable number.

38644405 is a deficient number, since it is larger than the sum of its proper divisors (7986179).

38644405 is a wasteful number, since it uses less digits than its factorization.

38644405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42887.

The product of its (nonzero) digits is 46080, while the sum is 34.

The square root of 38644405 is about 6216.4624184499. The cubic root of 38644405 is about 338.0873139038.

The spelling of 38644405 in words is "thirty-eight million, six hundred forty-four thousand, four hundred five".