168399722 has 12 divisors (see below), whose sum is σ = 268333350. Its totient is φ = 79246656.

The previous prime is 168399683. The next prime is 168399787. The reversal of 168399722 is 227993861.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 135233641 + 33166081 = 11629^2 + 5759^2 .

It is a nialpdrome in base 15.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 145097 + ... + 146252.

Almost surely, 2^168399722 is an apocalyptic number.

168399722 is a deficient number, since it is larger than the sum of its proper divisors (99933628).

168399722 is a wasteful number, since it uses less digits than its factorization.

168399722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291385 (or 291368 counting only the distinct ones).

The product of its digits is 326592, while the sum is 47.

The square root of 168399722 is about 12976.8918466634. The cubic root of 168399722 is about 552.2221087730. Note that the first 3 decimals are identical.

The spelling of 168399722 in words is "one hundred sixty-eight million, three hundred ninety-nine thousand, seven hundred twenty-two".