391222812 has 48 divisors (see below), whose sum is σ = 922600224. Its totient is φ = 129024000.

The previous prime is 391222681. The next prime is 391222813. The reversal of 391222812 is 218222193.

It is a self number, because there is not a number n which added to its sum of digits gives 391222812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391222813) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 610012 + ... + 610652.

It is an arithmetic number, because the mean of its divisors is an integer number (19220838).

Almost surely, 2^391222812 is an apocalyptic number.

It is an amenable number.

391222812 is an abundant number, since it is smaller than the sum of its proper divisors (531377412).

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

391222812 is a wasteful number, since it uses less digits than its factorization.

391222812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110 (or 1108 counting only the distinct ones).

The product of its digits is 3456, while the sum is 30.

The square root of 391222812 is about 19779.3531744595. The cubic root of 391222812 is about 731.3771538984.

The spelling of 391222812 in words is "three hundred ninety-one million, two hundred twenty-two thousand, eight hundred twelve".