312231240 has 64 divisors (see below), whose sum is σ = 1040774400. Its totient is φ = 83261376.

The previous prime is 312231229. The next prime is 312231251. The reversal of 312231240 is 42132213.

312231240 is a `hidden beast` number, since 312 + 2 + 312 + 40 = 666.

It is an interprime number because it is at equal distance from previous prime (312231229) and next prime (312231251).

It is a super-3 number, since 3×312231240³ (a number of 26 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143472 + ... + 145631.

It is an arithmetic number, because the mean of its divisors is an integer number (16262100).

Almost surely, 2^312231240 is an apocalyptic number.

312231240 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

312231240 is an abundant number, since it is smaller than the sum of its proper divisors (728543160).

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

312231240 is a wasteful number, since it uses less digits than its factorization.

312231240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289123 (or 289113 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 312231240 is about 17670.0662137978. The cubic root of 312231240 is about 678.4098078507.

Adding to 312231240 its reverse (42132213), we get a palindrome (354363453).

The spelling of 312231240 in words is "three hundred twelve million, two hundred thirty-one thousand, two hundred forty".