393215740 has 12 divisors (see below), whose sum is σ = 825753096. Its totient is φ = 157286288.

The previous prime is 393215717. The next prime is 393215813. The reversal of 393215740 is 47512393.

It is a junction number, because it is equal to n+sod(n) for n = 393215696 and 393215705.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9830374 + ... + 9830413.

It is an arithmetic number, because the mean of its divisors is an integer number (68812758).

Almost surely, 2^393215740 is an apocalyptic number.

It is an amenable number.

393215740 is an abundant number, since it is smaller than the sum of its proper divisors (432537356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

393215740 is a wasteful number, since it uses less digits than its factorization.

393215740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19660796 (or 19660794 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 393215740 is about 19829.6681767497. The cubic root of 393215740 is about 732.6169537618.

The spelling of 393215740 in words is "three hundred ninety-three million, two hundred fifteen thousand, seven hundred forty".