15978967 has 2 divisors, whose sum is σ = 15978968. Its totient is φ = 15978966.

The previous prime is 15978923. The next prime is 15978983. The reversal of 15978967 is 76987951.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15978967 - 2¹⁹ = 15454679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15973967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7989483 + 7989484.

It is an arithmetic number, because the mean of its divisors is an integer number (7989484).

Almost surely, 2^15978967 is an apocalyptic number.

15978967 is a deficient number, since it is larger than the sum of its proper divisors (1).

15978967 is an equidigital number, since it uses as much as digits as its factorization.

15978967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 952560, while the sum is 52.

The square root of 15978967 is about 3997.3700103943. The cubic root of 15978967 is about 251.8737452295.

The spelling of 15978967 in words is "fifteen million, nine hundred seventy-eight thousand, nine hundred sixty-seven".