391968228 has 48 divisors (see below), whose sum is σ = 925876224. Its totient is φ = 129054240.

The previous prime is 391968223. The next prime is 391968253. The reversal of 391968228 is 822869193.

It is a super-2 number, since 2×391968228² = 307278183522919968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (391968221) 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, 473551 + ... + 474377.

It is an arithmetic number, because the mean of its divisors is an integer number (19289088).

Almost surely, 2^391968228 is an apocalyptic number.

It is an amenable number.

391968228 is an abundant number, since it is smaller than the sum of its proper divisors (533907996).

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

391968228 is a wasteful number, since it uses less digits than its factorization.

391968228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1272 (or 1270 counting only the distinct ones).

The product of its digits is 373248, while the sum is 48.

The square root of 391968228 is about 19798.1874927984. The cubic root of 391968228 is about 731.8413687729.

The spelling of 391968228 in words is "three hundred ninety-one million, nine hundred sixty-eight thousand, two hundred twenty-eight".