391421226 has 64 divisors (see below), whose sum is σ = 950600448. Its totient is φ = 104890368.

The previous prime is 391421213. The next prime is 391421231. The reversal of 391421226 is 622124193.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 391421193 and 391421202.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 251266 + ... + 252818.

It is an arithmetic number, because the mean of its divisors is an integer number (14853132).

Almost surely, 2^391421226 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 391421226, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (475300224).

391421226 is an abundant number, since it is smaller than the sum of its proper divisors (559179222).

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

391421226 is a wasteful number, since it uses less digits than its factorization.

391421226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1935.

The product of its digits is 5184, while the sum is 30.

The square root of 391421226 is about 19784.3682234233. The cubic root of 391421226 is about 731.5007756442.

The spelling of 391421226 in words is "three hundred ninety-one million, four hundred twenty-one thousand, two hundred twenty-six".