168004406 has 4 divisors (see below), whose sum is σ = 252006612. Its totient is φ = 84002202.

The previous prime is 168004373. The next prime is 168004423. The reversal of 168004406 is 604400861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 604400861 = 29 ⋅20841409.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42001100 + ... + 42001103.

It is an arithmetic number, because the mean of its divisors is an integer number (63001653).

Almost surely, 2^168004406 is an apocalyptic number.

168004406 is a deficient number, since it is larger than the sum of its proper divisors (84002206).

168004406 is an equidigital number, since it uses as much as digits as its factorization.

168004406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84002205.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 168004406 is about 12961.6513608413. The cubic root of 168004406 is about 551.7896589721.

The spelling of 168004406 in words is "one hundred sixty-eight million, four thousand, four hundred six".