164691893 has 8 divisors (see below), whose sum is σ = 166380480. Its totient is φ = 163012000.

The previous prime is 164691889. The next prime is 164691931. The reversal of 164691893 is 398196461.

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

It is a cyclic number.

It is not a de Polignac number, because 164691893 - 2² = 164691889 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164691883) 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, 39953 + ... + 43881.

It is an arithmetic number, because the mean of its divisors is an integer number (20797560).

Almost surely, 2^164691893 is an apocalyptic number.

It is an amenable number.

164691893 is a deficient number, since it is larger than the sum of its proper divisors (1688587).

164691893 is a wasteful number, since it uses less digits than its factorization.

164691893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4347.

The product of its digits is 279936, while the sum is 47.

The square root of 164691893 is about 12833.2339260219. The cubic root of 164691893 is about 548.1390471123.

It can be divided in two parts, 1646 and 91893, that added together give a palindrome (93539).

The spelling of 164691893 in words is "one hundred sixty-four million, six hundred ninety-one thousand, eight hundred ninety-three".