307818 has 36 divisors (see below), whose sum is σ = 778050. Its totient is φ = 87696.

The previous prime is 307817. The next prime is 307823. The reversal of 307818 is 818703.

It can be written as a sum of positive squares in only one way, i.e., 233289 + 74529 = 483^2 + 273^2 .

It is a super-2 number, since 2×307818² = 189503842248, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 307791 and 307800.

It is not an unprimeable number, because it can be changed into a prime (307817) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 708 + ... + 1056.

2³⁰⁷⁸¹⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 307818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (389025).

307818 is an abundant number, since it is smaller than the sum of its proper divisors (470232).

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

307818 is a wasteful number, since it uses less digits than its factorization.

307818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371 (or 361 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 307818 is about 554.8134821722. The cubic root of 307818 is about 67.5198295650.

The spelling of 307818 in words is "three hundred seven thousand, eight hundred eighteen".