28940423 has 2 divisors, whose sum is σ = 28940424. Its totient is φ = 28940422.

The previous prime is 28940399. The next prime is 28940437. The reversal of 28940423 is 32404982.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28940423 - 2⁸ = 28940167 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28940423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28949423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14470211 + 14470212.

It is an arithmetic number, because the mean of its divisors is an integer number (14470212).

Almost surely, 2^28940423 is an apocalyptic number.

28940423 is a deficient number, since it is larger than the sum of its proper divisors (1).

28940423 is an equidigital number, since it uses as much as digits as its factorization.

28940423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 28940423 is about 5379.6303776375. The cubic root of 28940423 is about 307.0211481928.

The spelling of 28940423 in words is "twenty-eight million, nine hundred forty thousand, four hundred twenty-three".