311223400 has 24 divisors (see below), whose sum is σ = 723594870. Its totient is φ = 124489280.

The previous prime is 311223397. The next prime is 311223413. The reversal of 311223400 is 4322113.

It is a happy number.

311223400 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 191933316 + 119290084 = 13854^2 + 10922^2 .

It is a super-4 number, since 4×311223400⁴ (a number of 35 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 777859 + ... + 778258.

Almost surely, 2^311223400 is an apocalyptic number.

It is an amenable number.

311223400 is an abundant number, since it is smaller than the sum of its proper divisors (412371470).

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

311223400 is a wasteful number, since it uses less digits than its factorization.

311223400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1556133 (or 1556124 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 311223400 is about 17641.5248774022. The cubic root of 311223400 is about 677.6790828452.

Adding to 311223400 its reverse (4322113), we get a palindrome (315545513).

The spelling of 311223400 in words is "three hundred eleven million, two hundred twenty-three thousand, four hundred".