326401005 has 48 divisors (see below), whose sum is σ = 609690240. Its totient is φ = 148675968.

The previous prime is 326400973. The next prime is 326401007. The reversal of 326401005 is 500104623.

It is a happy number.

It is not a de Polignac number, because 326401005 - 2⁵ = 326400973 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (326401007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 263247 + ... + 264483.

It is an arithmetic number, because the mean of its divisors is an integer number (12701880).

Almost surely, 2^326401005 is an apocalyptic number.

326401005 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

326401005 is a deficient number, since it is larger than the sum of its proper divisors (283289235).

326401005 is a wasteful number, since it uses less digits than its factorization.

326401005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1618 (or 1611 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 326401005 is about 18066.5714788390. The cubic root of 326401005 is about 688.5209549512.

Adding to 326401005 its reverse (500104623), we get a palindrome (826505628).

The spelling of 326401005 in words is "three hundred twenty-six million, four hundred one thousand, five".