331218426 has 64 divisors (see below), whose sum is σ = 828610560. Its totient is φ = 85748160.

The previous prime is 331218397. The next prime is 331218427. The reversal of 331218426 is 624812133.

It is a junction number, because it is equal to n+sod(n) for n = 331218393 and 331218402.

It is not an unprimeable number, because it can be changed into a prime (331218427) 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, 164860 + ... + 166856.

It is an arithmetic number, because the mean of its divisors is an integer number (12947040).

Almost surely, 2^331218426 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 331218426, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (414305280).

331218426 is an abundant number, since it is smaller than the sum of its proper divisors (497392134).

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

331218426 is a wasteful number, since it uses less digits than its factorization.

331218426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2379.

The product of its digits is 6912, while the sum is 30.

The square root of 331218426 is about 18199.4072980413. The cubic root of 331218426 is about 691.8917672396.

The spelling of 331218426 in words is "three hundred thirty-one million, two hundred eighteen thousand, four hundred twenty-six".