185640312 has 64 divisors (see below), whose sum is σ = 545247360. Its totient is φ = 51926400.

The previous prime is 185640293. The next prime is 185640347. The reversal of 185640312 is 213046581.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 185640312.

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, 23614 + ... + 30477.

It is an arithmetic number, because the mean of its divisors is an integer number (8519490).

Almost surely, 2^185640312 is an apocalyptic number.

185640312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

185640312 is an abundant number, since it is smaller than the sum of its proper divisors (359607048).

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

185640312 is a wasteful number, since it uses less digits than its factorization.

185640312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54124 (or 54120 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 185640312 is about 13624.9885137566. The cubic root of 185640312 is about 570.4585537491.

Adding to 185640312 its reverse (213046581), we get a palindrome (398686893).

The spelling of 185640312 in words is "one hundred eighty-five million, six hundred forty thousand, three hundred twelve".