396979893 has 16 divisors (see below), whose sum is σ = 607091200. Its totient is φ = 256115520.

The previous prime is 396979873. The next prime is 396979909. The reversal of 396979893 is 398979693.

It is not a de Polignac number, because 396979893 - 2⁵ = 396979861 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 396979893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396979823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 236308 + ... + 237981.

It is an arithmetic number, because the mean of its divisors is an integer number (37943200).

Almost surely, 2^396979893 is an apocalyptic number.

It is an amenable number.

396979893 is a deficient number, since it is larger than the sum of its proper divisors (210111307).

396979893 is a wasteful number, since it uses less digits than its factorization.

396979893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474329 (or 474323 counting only the distinct ones).

The product of its digits is 19840464, while the sum is 63.

The square root of 396979893 is about 19924.3542680811. The cubic root of 396979893 is about 734.9472515248.

The spelling of 396979893 in words is "three hundred ninety-six million, nine hundred seventy-nine thousand, eight hundred ninety-three".