164396421 has 36 divisors (see below), whose sum is σ = 278046912. Its totient is φ = 93323664.

The previous prime is 164396413. The next prime is 164396423. The reversal of 164396421 is 124693461.

164396421 is a `hidden beast` number, since 1 + 6 + 4 + 3 + 9 + 642 + 1 = 666.

It is not a de Polignac number, because 164396421 - 2³ = 164396413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164396423) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 70740 + ... + 73026.

Almost surely, 2^164396421 is an apocalyptic number.

It is an amenable number.

164396421 is a deficient number, since it is larger than the sum of its proper divisors (113650491).

164396421 is a wasteful number, since it uses less digits than its factorization.

164396421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2470 (or 2460 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 164396421 is about 12821.7167727259. The cubic root of 164396421 is about 547.8110473729.

The spelling of 164396421 in words is "one hundred sixty-four million, three hundred ninety-six thousand, four hundred twenty-one".