168689434 has 4 divisors (see below), whose sum is σ = 253034154. Its totient is φ = 84344716.

The previous prime is 168689431. The next prime is 168689441. The reversal of 168689434 is 434986861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 127125625 + 41563809 = 11275^2 + 6447^2 .

It is a super-2 number, since 2×168689434² = 56912250286480712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (168689431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42172357 + ... + 42172360.

Almost surely, 2^168689434 is an apocalyptic number.

168689434 is a deficient number, since it is larger than the sum of its proper divisors (84344720).

168689434 is an equidigital number, since it uses as much as digits as its factorization.

168689434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84344719.

The product of its digits is 995328, while the sum is 49.

The square root of 168689434 is about 12988.0496611308. The cubic root of 168689434 is about 552.5386051661.

The spelling of 168689434 in words is "one hundred sixty-eight million, six hundred eighty-nine thousand, four hundred thirty-four".