315638642 has 16 divisors (see below), whose sum is σ = 516804192. Its totient is φ = 143387520.

The previous prime is 315638629. The next prime is 315638663. The reversal of 315638642 is 246836513.

It is a junction number, because it is equal to n+sod(n) for n = 315638596 and 315638605.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48578 + ... + 54690.

It is an arithmetic number, because the mean of its divisors is an integer number (32300262).

Almost surely, 2^315638642 is an apocalyptic number.

315638642 is a deficient number, since it is larger than the sum of its proper divisors (201165550).

315638642 is a wasteful number, since it uses less digits than its factorization.

315638642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8473.

The product of its digits is 103680, while the sum is 38.

The square root of 315638642 is about 17766.2219393995. The cubic root of 315638642 is about 680.8687296528.

The spelling of 315638642 in words is "three hundred fifteen million, six hundred thirty-eight thousand, six hundred forty-two".