312222440 has 32 divisors (see below), whose sum is σ = 739476000. Its totient is φ = 118315584.

The previous prime is 312222437. The next prime is 312222467. The reversal of 312222440 is 44222213.

312222440 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204650 + ... + 206169.

It is an arithmetic number, because the mean of its divisors is an integer number (23108625).

Almost surely, 2^312222440 is an apocalyptic number.

It is an amenable number.

312222440 is an abundant number, since it is smaller than the sum of its proper divisors (427253560).

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

312222440 is a wasteful number, since it uses less digits than its factorization.

312222440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410849 (or 410845 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 312222440 is about 17669.8172033556. The cubic root of 312222440 is about 678.4034343027.

Adding to 312222440 its reverse (44222213), we get a palindrome (356444653).

The spelling of 312222440 in words is "three hundred twelve million, two hundred twenty-two thousand, four hundred forty".