326404632391 has 8 divisors (see below), whose sum is σ = 326954145024. Its totient is φ = 325855540920.

The previous prime is 326404632373. The next prime is 326404632427. The reversal of 326404632391 is 193236404623.

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

It is a cyclic number.

It is not a de Polignac number, because 326404632391 - 2³⁷ = 188965678919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (326404632361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1465680 + ... + 1673626.

It is an arithmetic number, because the mean of its divisors is an integer number (40869268128).

Almost surely, 2^326404632391 is an apocalyptic number.

326404632391 is a deficient number, since it is larger than the sum of its proper divisors (549512633).

326404632391 is a wasteful number, since it uses less digits than its factorization.

326404632391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210581.

The product of its (nonzero) digits is 559872, while the sum is 43.

The spelling of 326404632391 in words is "three hundred twenty-six billion, four hundred four million, six hundred thirty-two thousand, three hundred ninety-one".