28397923 has 2 divisors, whose sum is σ = 28397924. Its totient is φ = 28397922.

The previous prime is 28397909. The next prime is 28397933. The reversal of 28397923 is 32979382.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28397923 - 2¹³ = 28389731 is a prime.

It is a super-3 number, since 3×28397923³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28397923.

It is not a weakly prime, because it can be changed into another prime (28397933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14198961 + 14198962.

It is an arithmetic number, because the mean of its divisors is an integer number (14198962).

Almost surely, 2^28397923 is an apocalyptic number.

28397923 is a deficient number, since it is larger than the sum of its proper divisors (1).

28397923 is an equidigital number, since it uses as much as digits as its factorization.

28397923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 43.

The square root of 28397923 is about 5328.9701631741. The cubic root of 28397923 is about 305.0906225383.

The spelling of 28397923 in words is "twenty-eight million, three hundred ninety-seven thousand, nine hundred twenty-three".