15920123 has 2 divisors, whose sum is σ = 15920124. Its totient is φ = 15920122.

The previous prime is 15920089. The next prime is 15920129. The reversal of 15920123 is 32102951.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15920123 - 2¹² = 15916027 is a prime.

It is not a weakly prime, because it can be changed into another prime (15920129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7960061 + 7960062.

It is an arithmetic number, because the mean of its divisors is an integer number (7960062).

Almost surely, 2^15920123 is an apocalyptic number.

15920123 is a deficient number, since it is larger than the sum of its proper divisors (1).

15920123 is an equidigital number, since it uses as much as digits as its factorization.

15920123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 15920123 is about 3990.0028822045. The cubic root of 15920123 is about 251.5641822580.

Subtracting from 15920123 its sum of digits (23), we obtain a square (15920100 = 3990²).

The spelling of 15920123 in words is "fifteen million, nine hundred twenty thousand, one hundred twenty-three".