38839643 has 4 divisors (see below), whose sum is σ = 39196080. Its totient is φ = 38483208.

The previous prime is 38839607. The next prime is 38839693. The reversal of 38839643 is 34693883.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34693883 = 7 ⋅4956269.

It is a cyclic number.

It is not a de Polignac number, because 38839643 - 2⁶ = 38839579 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 38839594 and 38839603.

It is not an unprimeable number, because it can be changed into a prime (38839693) 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, 178055 + ... + 178272.

It is an arithmetic number, because the mean of its divisors is an integer number (9799020).

Almost surely, 2^38839643 is an apocalyptic number.

38839643 is a deficient number, since it is larger than the sum of its proper divisors (356437).

38839643 is a wasteful number, since it uses less digits than its factorization.

38839643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356436.

The product of its digits is 373248, while the sum is 44.

The square root of 38839643 is about 6232.1459385993. The cubic root of 38839643 is about 338.6557156483.

Subtracting from 38839643 its reverse (34693883), we obtain a triangular number (4145760 = T₂₈₇₉).

The spelling of 38839643 in words is "thirty-eight million, eight hundred thirty-nine thousand, six hundred forty-three".