168890919 has 8 divisors (see below), whose sum is σ = 226432752. Its totient is φ = 111971520.

The previous prime is 168890899. The next prime is 168890921. The reversal of 168890919 is 919098861.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 168890919 - 2¹⁷ = 168759847 is a prime.

It is a super-2 number, since 2×168890919² = 57048285041329122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168890959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154974 + ... + 156059.

It is an arithmetic number, because the mean of its divisors is an integer number (28304094).

Almost surely, 2^168890919 is an apocalyptic number.

168890919 is a deficient number, since it is larger than the sum of its proper divisors (57541833).

168890919 is a wasteful number, since it uses less digits than its factorization.

168890919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311217.

The product of its (nonzero) digits is 279936, while the sum is 51.

The square root of 168890919 is about 12995.8038997209. The cubic root of 168890919 is about 552.7585042307.

The spelling of 168890919 in words is "one hundred sixty-eight million, eight hundred ninety thousand, nine hundred nineteen".