1640430323 has 8 divisors (see below), whose sum is σ = 1888266240. Its totient is φ = 1395966600.

The previous prime is 1640430313. The next prime is 1640430347. The reversal of 1640430323 is 3230340461.

It is a happy number.

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

It is not a de Polignac number, because 1640430323 - 2⁴ = 1640430307 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1640430292 and 1640430301.

It is not an unprimeable number, because it can be changed into a prime (1640430313) 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 7 ways as a sum of consecutive naturals, for example, 842003 + ... + 843948.

It is an arithmetic number, because the mean of its divisors is an integer number (236033280).

Almost surely, 2^1640430323 is an apocalyptic number.

1640430323 is a deficient number, since it is larger than the sum of its proper divisors (247835917).

1640430323 is a wasteful number, since it uses less digits than its factorization.

1640430323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1686097.

The product of its (nonzero) digits is 5184, while the sum is 26.

The square root of 1640430323 is about 40502.2261486946. The cubic root of 1640430323 is about 1179.3768429984.

Adding to 1640430323 its reverse (3230340461), we get a palindrome (4870770784).

The spelling of 1640430323 in words is "one billion, six hundred forty million, four hundred thirty thousand, three hundred twenty-three".