28939949 has 2 divisors, whose sum is σ = 28939950. Its totient is φ = 28939948.

The previous prime is 28939877. The next prime is 28939997. The reversal of 28939949 is 94993982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24571849 + 4368100 = 4957^2 + 2090^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28939949 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28939949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28989949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14469974 + 14469975.

It is an arithmetic number, because the mean of its divisors is an integer number (14469975).

Almost surely, 2^28939949 is an apocalyptic number.

It is an amenable number.

28939949 is a deficient number, since it is larger than the sum of its proper divisors (1).

28939949 is an equidigital number, since it uses as much as digits as its factorization.

28939949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1259712, while the sum is 53.

The square root of 28939949 is about 5379.5863223858. The cubic root of 28939949 is about 307.0194720043.

The spelling of 28939949 in words is "twenty-eight million, nine hundred thirty-nine thousand, nine hundred forty-nine".