311229640 has 16 divisors (see below), whose sum is σ = 700266780. Its totient is φ = 124491840.

The previous prime is 311229637. The next prime is 311229643. The reversal of 311229640 is 46922113.

It is an interprime number because it is at equal distance from previous prime (311229637) and next prime (311229643).

It can be written as a sum of positive squares in 2 ways, for example, as 294534244 + 16695396 = 17162^2 + 4086^2 .

It is a junction number, because it is equal to n+sod(n) for n = 311229599 and 311229608.

It is not an unprimeable number, because it can be changed into a prime (311229643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3890331 + ... + 3890410.

Almost surely, 2^311229640 is an apocalyptic number.

It is an amenable number.

311229640 is an abundant number, since it is smaller than the sum of its proper divisors (389037140).

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

311229640 is a wasteful number, since it uses less digits than its factorization.

311229640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7780752 (or 7780748 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 311229640 is about 17641.7017319759. The cubic root of 311229640 is about 677.6836119490.

The spelling of 311229640 in words is "three hundred eleven million, two hundred twenty-nine thousand, six hundred forty".