38818643 has 4 divisors (see below), whose sum is σ = 39203088. Its totient is φ = 38434200.

The previous prime is 38818609. The next prime is 38818657. The reversal of 38818643 is 34681883.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34681883 = 29 ⋅1195927.

It is a cyclic number.

It is not a de Polignac number, because 38818643 - 2⁶ = 38818579 is a prime.

It is a super-2 number, since 2×38818643² = 3013774088722898, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 38818643.

It is not an unprimeable number, because it can be changed into a prime (38818673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192071 + ... + 192272.

It is an arithmetic number, because the mean of its divisors is an integer number (9800772).

Almost surely, 2^38818643 is an apocalyptic number.

38818643 is a deficient number, since it is larger than the sum of its proper divisors (384445).

38818643 is a wasteful number, since it uses less digits than its factorization.

38818643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384444.

The product of its digits is 110592, while the sum is 41.

The square root of 38818643 is about 6230.4608978791. The cubic root of 38818643 is about 338.5946693255.

The spelling of 38818643 in words is "thirty-eight million, eight hundred eighteen thousand, six hundred forty-three".