312403221240 has 64 divisors (see below), whose sum is σ = 1022410546560. Its totient is φ = 75734113920.

The previous prime is 312403221239. The next prime is 312403221287. The reversal of 312403221240 is 42122304213.

It is a happy number.

It is a super-2 number, since 2×312403221240² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 312403221240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118333234 + ... + 118335873.

It is an arithmetic number, because the mean of its divisors is an integer number (15975164790).

Almost surely, 2^312403221240 is an apocalyptic number.

312403221240 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

312403221240 is an abundant number, since it is smaller than the sum of its proper divisors (710007325320).

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

312403221240 is a wasteful number, since it uses less digits than its factorization.

312403221240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236669132 (or 236669128 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 312403221240 its reverse (42122304213), we get a palindrome (354525525453).

The spelling of 312403221240 in words is "three hundred twelve billion, four hundred three million, two hundred twenty-one thousand, two hundred forty".