394198951 has 4 divisors (see below), whose sum is σ = 394824304. Its totient is φ = 393573600.

The previous prime is 394198949. The next prime is 394198957. The reversal of 394198951 is 159891493.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 394198951 - 2¹ = 394198949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 394198895 and 394198904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394198957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 311730 + ... + 312991.

It is an arithmetic number, because the mean of its divisors is an integer number (98706076).

Almost surely, 2^394198951 is an apocalyptic number.

394198951 is a deficient number, since it is larger than the sum of its proper divisors (625353).

394198951 is an equidigital number, since it uses as much as digits as its factorization.

394198951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625352.

The product of its digits is 349920, while the sum is 49.

The square root of 394198951 is about 19854.4441120873. Note that the first 3 decimals coincide. The cubic root of 394198951 is about 733.2270662591.

The spelling of 394198951 in words is "three hundred ninety-four million, one hundred ninety-eight thousand, nine hundred fifty-one".