396766561 has 3 divisors (see below), whose sum is σ = 396786481. Its totient is φ = 396746642.
The previous prime is 396766541. The next prime is 396766571. The reversal of 396766561 is 165667693.
The square root of 396766561 is 19919.
It is a perfect power (a square), and thus also a powerful number.
It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 165667693 = 59 ⋅2807927.
It is not a de Polignac number, because 396766561 - 29 = 396766049 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (396766501) by changing a digit.
It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 9960 + ... + 29878.
Almost surely, 2396766561 is an apocalyptic number.
396766561 is the 19919-th square number.
396766561 is the 9960-th centered octagonal number.
It is an amenable number.
396766561 is a deficient number, since it is larger than the sum of its proper divisors (19920).
396766561 is an frugal number, since it uses more digits than its factorization.
396766561 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 39838 (or 19919 counting only the distinct ones).
The product of its digits is 1224720, while the sum is 49.
The cubic root of 396766561 is about 734.8155774665.
Multiplying 396766561 by its sum of digits (49), we get a square (19441561489 = 1394332).
The spelling of 396766561 in words is "three hundred ninety-six million, seven hundred sixty-six thousand, five hundred sixty-one".
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