16403923 has 2 divisors, whose sum is σ = 16403924. Its totient is φ = 16403922.

The previous prime is 16403887. The next prime is 16403927. The reversal of 16403923 is 32930461.

It is a strong prime.

It is an emirp because it is prime and its reverse (32930461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16403923 - 2²¹ = 14306771 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16403891 and 16403900.

It is not a weakly prime, because it can be changed into another prime (16403927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8201961 + 8201962.

It is an arithmetic number, because the mean of its divisors is an integer number (8201962).

Almost surely, 2^16403923 is an apocalyptic number.

16403923 is a deficient number, since it is larger than the sum of its proper divisors (1).

16403923 is an equidigital number, since it uses as much as digits as its factorization.

16403923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 16403923 is about 4050.1756752022. The cubic root of 16403923 is about 254.0870751534.

The spelling of 16403923 in words is "sixteen million, four hundred three thousand, nine hundred twenty-three".