391408426 has 8 divisors (see below), whose sum is σ = 587317284. Its totient is φ = 195636000.

The previous prime is 391408399. The next prime is 391408429. The reversal of 391408426 is 624804193.

It can be written as a sum of positive squares in 2 ways, for example, as 384199201 + 7209225 = 19601^2 + 2685^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (391408429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26605 + ... + 38608.

Almost surely, 2^391408426 is an apocalyptic number.

391408426 is a deficient number, since it is larger than the sum of its proper divisors (195908858).

391408426 is a wasteful number, since it uses less digits than its factorization.

391408426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68216.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 391408426 is about 19784.0447330671. The cubic root of 391408426 is about 731.4928018713.

The spelling of 391408426 in words is "three hundred ninety-one million, four hundred eight thousand, four hundred twenty-six".