15978023 has 2 divisors, whose sum is σ = 15978024. Its totient is φ = 15978022.

The previous prime is 15977981. The next prime is 15978037. The reversal of 15978023 is 32087951.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15978023 - 2¹⁸ = 15715879 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15978223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7989011 + 7989012.

It is an arithmetic number, because the mean of its divisors is an integer number (7989012).

Almost surely, 2^15978023 is an apocalyptic number.

15978023 is a deficient number, since it is larger than the sum of its proper divisors (1).

15978023 is an equidigital number, since it uses as much as digits as its factorization.

15978023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 15978023 is about 3997.2519310146. The cubic root of 15978023 is about 251.8687850946.

The spelling of 15978023 in words is "fifteen million, nine hundred seventy-eight thousand, twenty-three".