393145640 has 16 divisors (see below), whose sum is σ = 884577780. Its totient is φ = 157258240.

The previous prime is 393145637. The next prime is 393145667. The reversal of 393145640 is 46541393.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 389588644 + 3556996 = 19738^2 + 1886^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 393145640.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4914281 + ... + 4914360.

Almost surely, 2^393145640 is an apocalyptic number.

It is an amenable number.

393145640 is an abundant number, since it is smaller than the sum of its proper divisors (491432140).

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

393145640 is a wasteful number, since it uses less digits than its factorization.

393145640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9828652 (or 9828648 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 393145640 is about 19827.9005444349. The cubic root of 393145640 is about 732.5734157449.

The spelling of 393145640 in words is "three hundred ninety-three million, one hundred forty-five thousand, six hundred forty".