15998963 has 2 divisors, whose sum is σ = 15998964. Its totient is φ = 15998962.

The previous prime is 15998959. The next prime is 15998977. The reversal of 15998963 is 36989951.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15998963 - 2² = 15998959 is a prime.

It is not a weakly prime, because it can be changed into another prime (15998933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7999481 + 7999482.

It is an arithmetic number, because the mean of its divisors is an integer number (7999482).

Almost surely, 2^15998963 is an apocalyptic number.

15998963 is a deficient number, since it is larger than the sum of its proper divisors (1).

15998963 is an equidigital number, since it uses as much as digits as its factorization.

15998963 is an evil number, because the sum of its binary digits is even.

The product of its digits is 524880, while the sum is 50.

The square root of 15998963 is about 3999.8703728996. The cubic root of 15998963 is about 251.9787659525.

It can be divided in two parts, 15998 and 963, that added together give a palindrome (16961).

The spelling of 15998963 in words is "fifteen million, nine hundred ninety-eight thousand, nine hundred sixty-three".