396993409691 has 4 divisors (see below), whose sum is σ = 397752479832. Its totient is φ = 396234339552.

The previous prime is 396993409661. The next prime is 396993409693. The reversal of 396993409691 is 196904399693.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 196904399693 = 743 ⋅265012651.

It is a cyclic number.

It is not a de Polignac number, because 396993409691 - 2⁶ = 396993409627 is a prime.

It is a super-3 number, since 3×396993409691³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (396993409693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 379534286 + ... + 379535331.

It is an arithmetic number, because the mean of its divisors is an integer number (99438119958).

Almost surely, 2^396993409691 is an apocalyptic number.

396993409691 is a deficient number, since it is larger than the sum of its proper divisors (759070141).

396993409691 is an equidigital number, since it uses as much as digits as its factorization.

396993409691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 759070140.

The product of its (nonzero) digits is 76527504, while the sum is 68.

The spelling of 396993409691 in words is "three hundred ninety-six billion, nine hundred ninety-three million, four hundred nine thousand, six hundred ninety-one".