391444992 has 240 divisors, whose sum is σ = 1263936960. Its totient is φ = 115900416.

The previous prime is 391444969. The next prime is 391444997. The reversal of 391444992 is 299444193.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391444997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1488253 + ... + 1488515.

It is an arithmetic number, because the mean of its divisors is an integer number (5266404).

Almost surely, 2^391444992 is an apocalyptic number.

391444992 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 391444992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (631968480).

391444992 is an abundant number, since it is smaller than the sum of its proper divisors (872491968).

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

391444992 is a wasteful number, since it uses less digits than its factorization.

391444992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323 (or 304 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 391444992 is about 19784.9688400058. The cubic root of 391444992 is about 731.5155802370.

The spelling of 391444992 in words is "three hundred ninety-one million, four hundred forty-four thousand, nine hundred ninety-two".