396091195721 has 8 divisors (see below), whose sum is σ = 427059831240. Its totient is φ = 365194000512.

The previous prime is 396091195673. The next prime is 396091195783. The reversal of 396091195721 is 127591190693.

It can be written as a sum of positive squares in 4 ways, for example, as 19415635600 + 376675560121 = 139340^2 + 613739^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 396091195721 - 2⁶ = 396091195657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (396091195121) 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, 17848556 + ... + 17870733.

It is an arithmetic number, because the mean of its divisors is an integer number (53382478905).

Almost surely, 2^396091195721 is an apocalyptic number.

It is an amenable number.

396091195721 is a deficient number, since it is larger than the sum of its proper divisors (30968635519).

396091195721 is a wasteful number, since it uses less digits than its factorization.

396091195721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35720155.

The product of its (nonzero) digits is 918540, while the sum is 53.

The spelling of 396091195721 in words is "three hundred ninety-six billion, ninety-one million, one hundred ninety-five thousand, seven hundred twenty-one".