394905412225 has 9 divisors (see below), whose sum is σ = 489686607363. Its totient is φ = 315921816120.

The previous prime is 394905412219. The next prime is 394905412241. The reversal of 394905412225 is 522214509493.

The square root of 394905412225 is 628415.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 142165948401 + 252739463824 = 377049^2 + 502732^2 .

It is not a de Polignac number, because 394905412225 - 2³ = 394905412217 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3079234 + ... + 3204916.

Almost surely, 2^394905412225 is an apocalyptic number.

394905412225 is the 628415-th square number.

394905412225 is the 314208-th centered octagonal number.

It is an amenable number.

394905412225 is a deficient number, since it is larger than the sum of its proper divisors (94781195138).

394905412225 is an frugal number, since it uses more digits than its factorization.

394905412225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251376 (or 125688 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 46.

The spelling of 394905412225 in words is "three hundred ninety-four billion, nine hundred five million, four hundred twelve thousand, two hundred twenty-five".