39428 has 6 divisors (see below), whose sum is σ = 69006. Its totient is φ = 19712.

The previous prime is 39419. The next prime is 39439. The reversal of 39428 is 82493.

It can be written as a sum of positive squares in only one way, i.e., 31684 + 7744 = 178^2 + 88^2 .

It is a d-powerful number, because it can be written as 3⁸ + 9² + 4² + 2 + 8⁵ .

It is a junction number, because it is equal to n+sod(n) for n = 39397 and 39406.

It is an unprimeable number.

39428 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4925 + ... + 4932.

It is an arithmetic number, because the mean of its divisors is an integer number (11501).

2³⁹⁴²⁸ is an apocalyptic number.

It is an amenable number.

39428 is a deficient number, since it is larger than the sum of its proper divisors (29578).

39428 is a wasteful number, since it uses less digits than its factorization.

39428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9861 (or 9859 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 39428 is about 198.5648508674. The cubic root of 39428 is about 34.0357179428.

The spelling of 39428 in words is "thirty-nine thousand, four hundred twenty-eight".