397636081 has 8 divisors (see below), whose sum is σ = 421381800. Its totient is φ = 374559360.

The previous prime is 397636079. The next prime is 397636117. The reversal of 397636081 is 180636793.

It can be written as a sum of positive squares in 4 ways, for example, as 19722481 + 377913600 = 4441^2 + 19440^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 397636081 - 2¹ = 397636079 is a prime.

It is a super-2 number, since 2×397636081² = 316228905826077122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397636021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166026 + ... + 168403.

It is an arithmetic number, because the mean of its divisors is an integer number (52672725).

Almost surely, 2^397636081 is an apocalyptic number.

It is an amenable number.

397636081 is a deficient number, since it is larger than the sum of its proper divisors (23745719).

397636081 is a wasteful number, since it uses less digits than its factorization.

397636081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334499.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 397636081 is about 19940.8144517720. The cubic root of 397636081 is about 735.3519723516.

The spelling of 397636081 in words is "three hundred ninety-seven million, six hundred thirty-six thousand, eighty-one".