316821738 has 32 divisors (see below), whose sum is σ = 645345792. Its totient is φ = 103670000.

The previous prime is 316821697. The next prime is 316821763. The reversal of 316821738 is 837128613.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 316821696 and 316821705.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105445 + ... + 108407.

It is an arithmetic number, because the mean of its divisors is an integer number (20167056).

Almost surely, 2^316821738 is an apocalyptic number.

316821738 is an abundant number, since it is smaller than the sum of its proper divisors (328524054).

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

316821738 is a wasteful number, since it uses less digits than its factorization.

316821738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3290.

The product of its digits is 48384, while the sum is 39.

The square root of 316821738 is about 17799.4870150800. The cubic root of 316821738 is about 681.7183602162.

The spelling of 316821738 in words is "three hundred sixteen million, eight hundred twenty-one thousand, seven hundred thirty-eight".