331420 has 24 divisors (see below), whose sum is σ = 708624. Its totient is φ = 130176.

The previous prime is 331399. The next prime is 331423. The reversal of 331420 is 24133.

331420 = T₂₂₉ + T₂₃₀ + ... + T₂₄₀.

331420 = 28² + 29² + ... + 100².

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 331420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331423) by changing a digit.

331420 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1347 + ... + 1573.

It is an arithmetic number, because the mean of its divisors is an integer number (29526).

2³³¹⁴²⁰ is an apocalyptic number.

It is an amenable number.

331420 is an abundant number, since it is smaller than the sum of its proper divisors (377204).

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

331420 is a wasteful number, since it uses less digits than its factorization.

331420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309 (or 307 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 331420 is about 575.6908892800. The cubic root of 331420 is about 69.2032096699.

Adding to 331420 its reverse (24133), we get a palindrome (355553).

The spelling of 331420 in words is "three hundred thirty-one thousand, four hundred twenty".