315129393 has 32 divisors (see below), whose sum is σ = 478241280. Its totient is φ = 205027200.

The previous prime is 315129389. The next prime is 315129401. The reversal of 315129393 is 393921513.

It is not a de Polignac number, because 315129393 - 2² = 315129389 is a prime.

It is not an unprimeable number, because it can be changed into a prime (315129293) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 198280 + ... + 199862.

It is an arithmetic number, because the mean of its divisors is an integer number (14945040).

Almost surely, 2^315129393 is an apocalyptic number.

It is an amenable number.

315129393 is a deficient number, since it is larger than the sum of its proper divisors (163111887).

315129393 is a wasteful number, since it uses less digits than its factorization.

315129393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1766 (or 1760 counting only the distinct ones).

The product of its digits is 21870, while the sum is 36.

The square root of 315129393 is about 17751.8842098522. The cubic root of 315129393 is about 680.5023630631.

The spelling of 315129393 in words is "three hundred fifteen million, one hundred twenty-nine thousand, three hundred ninety-three".