194398981 has 8 divisors (see below), whose sum is σ = 222283904. Its totient is φ = 166542480.

The previous prime is 194398973. The next prime is 194399017. The reversal of 194398981 is 189893491.

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 194398981 - 2³ = 194398973 is a prime.

It is a super-2 number, since 2×194398981² = 75581927627676722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194398901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10456 + ... + 22318.

It is an arithmetic number, because the mean of its divisors is an integer number (27785488).

Almost surely, 2^194398981 is an apocalyptic number.

It is an amenable number.

194398981 is a deficient number, since it is larger than the sum of its proper divisors (27884923).

194398981 is a wasteful number, since it uses less digits than its factorization.

194398981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14211.

The product of its digits is 559872, while the sum is 52.

The square root of 194398981 is about 13942.7035039837. The cubic root of 194398981 is about 579.2926185870.

The spelling of 194398981 in words is "one hundred ninety-four million, three hundred ninety-eight thousand, nine hundred eighty-one".