168406963 has 6 divisors (see below), whose sum is σ = 172410524. Its totient is φ = 164407404.

The previous prime is 168406949. The next prime is 168406991. The reversal of 168406963 is 369604861.

It is a de Polignac number, because none of the positive numbers 2^k-168406963 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168406933) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 84108 + ... + 86086.

Almost surely, 2^168406963 is an apocalyptic number.

168406963 is a deficient number, since it is larger than the sum of its proper divisors (4003561).

168406963 is an frugal number, since it uses more digits than its factorization.

168406963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4001 (or 2022 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 43.

The square root of 168406963 is about 12977.1708395937. The cubic root of 168406963 is about 552.2300236376.

Multiplying 168406963 by its sum of digits (43), we get a square (7241499409 = 85097²).

168406963 divided by its sum of digits (43) gives a square (3916441 = 1979²).

The spelling of 168406963 in words is "one hundred sixty-eight million, four hundred six thousand, nine hundred sixty-three".