394186872 has 16 divisors (see below), whose sum is σ = 985467240. Its totient is φ = 131395616.

The previous prime is 394186861. The next prime is 394186873. The reversal of 394186872 is 278681493.

It is a super-3 number, since 3×394186872³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394186873) 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, 8212203 + ... + 8212250.

Almost surely, 2^394186872 is an apocalyptic number.

It is an amenable number.

394186872 is an abundant number, since it is smaller than the sum of its proper divisors (591280368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

394186872 is a wasteful number, since it uses less digits than its factorization.

394186872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16424462 (or 16424458 counting only the distinct ones).

The product of its digits is 580608, while the sum is 48.

The square root of 394186872 is about 19854.1399209334. The cubic root of 394186872 is about 733.2195770288.

The spelling of 394186872 in words is "three hundred ninety-four million, one hundred eighty-six thousand, eight hundred seventy-two".