1640334401 has 16 divisors (see below), whose sum is σ = 1747095168. Its totient is φ = 1536796800.

The previous prime is 1640334389. The next prime is 1640334407. The reversal of 1640334401 is 1044330461.

It is a cyclic number.

It is not a de Polignac number, because 1640334401 - 2¹⁸ = 1640072257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1640334407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 275981 + ... + 281861.

It is an arithmetic number, because the mean of its divisors is an integer number (109193448).

Almost surely, 2^1640334401 is an apocalyptic number.

It is an amenable number.

1640334401 is a deficient number, since it is larger than the sum of its proper divisors (106760767).

1640334401 is a wasteful number, since it uses less digits than its factorization.

1640334401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6152.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 1640334401 is about 40501.0419742505. The cubic root of 1640334401 is about 1179.3538550484.

Adding to 1640334401 its reverse (1044330461), we get a palindrome (2684664862).

The spelling of 1640334401 in words is "one billion, six hundred forty million, three hundred thirty-four thousand, four hundred one".