38643705 has 12 divisors (see below), whose sum is σ = 66982500. Its totient is φ = 20609952.

The previous prime is 38643697. The next prime is 38643707. The reversal of 38643705 is 50734683.

It is a happy number.

38643705 is a `hidden beast` number, since 3 + 8 + 643 + 7 + 0 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 23736384 + 14907321 = 4872^2 + 3861^2 .

It is not a de Polignac number, because 38643705 - 2³ = 38643697 is a prime.

It is a super-2 number, since 2×38643705² = 2986671872254050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 38643705.

It is not an unprimeable number, because it can be changed into a prime (38643707) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 429330 + ... + 429419.

It is an arithmetic number, because the mean of its divisors is an integer number (5581875).

Almost surely, 2^38643705 is an apocalyptic number.

It is an amenable number.

38643705 is a deficient number, since it is larger than the sum of its proper divisors (28338795).

38643705 is a wasteful number, since it uses less digits than its factorization.

38643705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 858760 (or 858757 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 38643705 is about 6216.4061160770. The cubic root of 38643705 is about 338.0852725342.

It can be divided in two parts, 3864 and 3705, that added together give a square (7569 = 87²).

The spelling of 38643705 in words is "thirty-eight million, six hundred forty-three thousand, seven hundred five".