391281894 has 32 divisors (see below), whose sum is σ = 920665440. Its totient is φ = 122754816.

The previous prime is 391281887. The next prime is 391281899. The reversal of 391281894 is 498182193.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391281899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212199 + ... + 214034.

It is an arithmetic number, because the mean of its divisors is an integer number (28770795).

Almost surely, 2^391281894 is an apocalyptic number.

391281894 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

391281894 is an abundant number, since it is smaller than the sum of its proper divisors (529383546).

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

391281894 is a wasteful number, since it uses less digits than its factorization.

391281894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426261 (or 426255 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 391281894 is about 19780.8466451767. The cubic root of 391281894 is about 731.4139692788.

The spelling of 391281894 in words is "three hundred ninety-one million, two hundred eighty-one thousand, eight hundred ninety-four".