396949141521 has 45 divisors (see below), whose sum is σ = 600946917051. Its totient is φ = 252489389328.

The previous prime is 396949141481. The next prime is 396949141531. The reversal of 396949141521 is 125141949693.

The square root of 396949141521 is 630039.

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

396949141521 is a `hidden beast` number, since 3 + 9 + 69 + 49 + 14 + 1 + 521 = 666.

It can be written as a sum of positive squares in only one way, i.e., 266023850625 + 130925290896 = 515775^2 + 361836^2 .

It is a de Polignac number, because none of the positive numbers 2^k-396949141521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (396949141531) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 999871695 + ... + 999872091.

Almost surely, 2^396949141521 is an apocalyptic number.

396949141521 is the 630039-th square number.

396949141521 is the 315020-th centered octagonal number.

It is an amenable number.

396949141521 is a deficient number, since it is larger than the sum of its proper divisors (203997775530).

396949141521 is an frugal number, since it uses more digits than its factorization.

396949141521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 892 (or 423 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 54.

The spelling of 396949141521 in words is "three hundred ninety-six billion, nine hundred forty-nine million, one hundred forty-one thousand, five hundred twenty-one".