391394850 has 288 divisors, whose sum is σ = 1270204416. Its totient is φ = 78825600.

The previous prime is 391394827. The next prime is 391394881. The reversal of 391394850 is 58493193.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

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 143 ways as a sum of consecutive naturals, for example, 3799899 + ... + 3800001.

It is an arithmetic number, because the mean of its divisors is an integer number (4410432).

Almost surely, 2^391394850 is an apocalyptic number.

391394850 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 391394850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (635102208).

391394850 is an abundant number, since it is smaller than the sum of its proper divisors (878809566).

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

391394850 is a wasteful number, since it uses less digits than its factorization.

391394850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190 (or 178 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 42.

The square root of 391394850 is about 19783.7016253279. The cubic root of 391394850 is about 731.4843444983.

The spelling of 391394850 in words is "three hundred ninety-one million, three hundred ninety-four thousand, eight hundred fifty".