331220412 has 18 divisors (see below), whose sum is σ = 837251688. Its totient is φ = 110406792.

The previous prime is 331220389. The next prime is 331220413. The reversal of 331220412 is 214022133.

331220412 is a `hidden beast` number, since 3 + 31 + 220 + 412 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×331220412² = 219413922650899488, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331220413) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4600248 + ... + 4600319.

Almost surely, 2^331220412 is an apocalyptic number.

It is an amenable number.

331220412 is an abundant number, since it is smaller than the sum of its proper divisors (506031276).

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

331220412 is a wasteful number, since it uses less digits than its factorization.

331220412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9200577 (or 9200572 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 331220412 is about 18199.4618601760. The cubic root of 331220412 is about 691.8931501079.

Adding to 331220412 its reverse (214022133), we get a palindrome (545242545).

The spelling of 331220412 in words is "three hundred thirty-one million, two hundred twenty thousand, four hundred twelve".