311144420 has 24 divisors (see below), whose sum is σ = 653958144. Its totient is φ = 124352096.

The previous prime is 311144419. The next prime is 311144429. The reversal of 311144420 is 24441113.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 311144392 and 311144401.

It is not an unprimeable number, because it can be changed into a prime (311144429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20189 + ... + 32091.

It is an arithmetic number, because the mean of its divisors is an integer number (27248256).

Almost surely, 2^311144420 is an apocalyptic number.

It is an amenable number.

311144420 is an abundant number, since it is smaller than the sum of its proper divisors (342813724).

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

311144420 is a wasteful number, since it uses less digits than its factorization.

311144420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13219 (or 13217 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 311144420 is about 17639.2862667399. The cubic root of 311144420 is about 677.6217525136.

Adding to 311144420 its reverse (24441113), we get a palindrome (335585533).

The spelling of 311144420 in words is "three hundred eleven million, one hundred forty-four thousand, four hundred twenty".