194426821 has 4 divisors (see below), whose sum is σ = 196888000. Its totient is φ = 191965644.

The previous prime is 194426809. The next prime is 194426833. The reversal of 194426821 is 128624491.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (194426809) and next prime (194426833).

It is a cyclic number.

It is not a de Polignac number, because 194426821 - 2¹⁷ = 194295749 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 (194426891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1230471 + ... + 1230628.

It is an arithmetic number, because the mean of its divisors is an integer number (49222000).

Almost surely, 2^194426821 is an apocalyptic number.

It is an amenable number.

194426821 is a deficient number, since it is larger than the sum of its proper divisors (2461179).

194426821 is an equidigital number, since it uses as much as digits as its factorization.

194426821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2461178.

The product of its digits is 27648, while the sum is 37.

The square root of 194426821 is about 13943.7018398989. The cubic root of 194426821 is about 579.3202708868.

The spelling of 194426821 in words is "one hundred ninety-four million, four hundred twenty-six thousand, eight hundred twenty-one".