394643973452180 has 24 divisors (see below), whose sum is σ = 877502482147368. Its totient is φ = 148571848828928.

The previous prime is 394643973452161. The next prime is 394643973452221. The reversal of 394643973452180 is 81254379346493.

It can be written as a sum of positive squares in 4 ways, for example, as 10431130035076 + 384212843417104 = 3229726^2 + 19601348^2 .

It is a Harshad number since it is a multiple of its sum of digits (68).

It is a self number, because there is not a number n which added to its sum of digits gives 394643973452180.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 580358784149 + ... + 580358784828.

It is an arithmetic number, because the mean of its divisors is an integer number (36562603422807).

It is a 1-persistent number, because it is pandigital, but 2⋅394643973452180 = 789287946904360 is not.

Almost surely, 2^{394643973452180} is an apocalyptic number.

It is an amenable number.

394643973452180 is an abundant number, since it is smaller than the sum of its proper divisors (482858508695188).

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

394643973452180 is a wasteful number, since it uses less digits than its factorization.

394643973452180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1160717569003 (or 1160717569001 counting only the distinct ones).

The product of its (nonzero) digits is 470292480, while the sum is 68.

The spelling of 394643973452180 in words is "three hundred ninety-four trillion, six hundred forty-three billion, nine hundred seventy-three million, four hundred fifty-two thousand, one hundred eighty".