28139983 has 2 divisors, whose sum is σ = 28139984. Its totient is φ = 28139982.

The previous prime is 28139977. The next prime is 28139987. The reversal of 28139983 is 38993182.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28139983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28139987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14069991 + 14069992.

It is an arithmetic number, because the mean of its divisors is an integer number (14069992).

Almost surely, 2^28139983 is an apocalyptic number.

28139983 is a deficient number, since it is larger than the sum of its proper divisors (1).

28139983 is an equidigital number, since it uses as much as digits as its factorization.

28139983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 43.

The square root of 28139983 is about 5304.7132816016. The cubic root of 28139983 is about 304.1640929371.

The spelling of 28139983 in words is "twenty-eight million, one hundred thirty-nine thousand, nine hundred eighty-three".