1640454323 has 8 divisors (see below), whose sum is σ = 1728400128. Its totient is φ = 1553893704.

The previous prime is 1640454313. The next prime is 1640454367. The reversal of 1640454323 is 3234540461.

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 1640454323 - 2¹⁶ = 1640388787 is a prime.

It is a super-3 number, since 3×1640454323³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1640454323.

It is not an unprimeable number, because it can be changed into a prime (1640454313) 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, 343865 + ... + 348602.

It is an arithmetic number, because the mean of its divisors is an integer number (216050016).

Almost surely, 2^1640454323 is an apocalyptic number.

1640454323 is a deficient number, since it is larger than the sum of its proper divisors (87945805).

1640454323 is a wasteful number, since it uses less digits than its factorization.

1640454323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692593.

The product of its (nonzero) digits is 34560, while the sum is 32.

The square root of 1640454323 is about 40502.5224276217. The cubic root of 1640454323 is about 1179.3825945189.

Adding to 1640454323 its reverse (3234540461), we get a palindrome (4874994784).

The spelling of 1640454323 in words is "one billion, six hundred forty million, four hundred fifty-four thousand, three hundred twenty-three".