393507945 has 24 divisors (see below), whose sum is σ = 686177856. Its totient is φ = 208610208.

The previous prime is 393507911. The next prime is 393507949. The reversal of 393507945 is 549705393.

It is not a de Polignac number, because 393507945 - 2¹¹ = 393505897 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 393507945.

It is not an unprimeable number, because it can be changed into a prime (393507949) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18667 + ... + 33696.

It is an arithmetic number, because the mean of its divisors is an integer number (28590744).

Almost surely, 2^393507945 is an apocalyptic number.

It is an amenable number.

393507945 is a deficient number, since it is larger than the sum of its proper divisors (292669911).

393507945 is a wasteful number, since it uses less digits than its factorization.

393507945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52541 (or 52538 counting only the distinct ones).

The product of its (nonzero) digits is 510300, while the sum is 45.

The square root of 393507945 is about 19837.0346826334. The cubic root of 393507945 is about 732.7983820124.

The spelling of 393507945 in words is "three hundred ninety-three million, five hundred seven thousand, nine hundred forty-five".