1640324421 has 24 divisors (see below), whose sum is σ = 2447827200. Its totient is φ = 1057392000.

The previous prime is 1640324383. The next prime is 1640324423. The reversal of 1640324421 is 1244230461.

It is a happy number.

1640324421 is a `hidden beast` number, since 16 + 403 + 244 + 2 + 1 = 666.

It is not a de Polignac number, because 1640324421 - 2¹⁰ = 1640323397 is a prime.

It is a super-2 number, since 2×1640324421² = 5381328412257970482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640324423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 584221 + ... + 587021.

It is an arithmetic number, because the mean of its divisors is an integer number (101992800).

Almost surely, 2^1640324421 is an apocalyptic number.

It is an amenable number.

1640324421 is a deficient number, since it is larger than the sum of its proper divisors (807502779).

1640324421 is a wasteful number, since it uses less digits than its factorization.

1640324421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4937 (or 4934 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 1640324421 is about 40500.9187673564. The cubic root of 1640324421 is about 1179.3514632647.

Adding to 1640324421 its reverse (1244230461), we get a palindrome (2884554882).

The spelling of 1640324421 in words is "one billion, six hundred forty million, three hundred twenty-four thousand, four hundred twenty-one".