640119389 has 24 divisors (see below), whose sum is σ = 806136408. Its totient is φ = 503798400.

The previous prime is 640119331. The next prime is 640119401. The reversal of 640119389 is 983911046.

It can be written as a sum of positive squares in 4 ways, for example, as 11764900 + 628354489 = 3430^2 + 25067^2 .

It is a de Polignac number, because none of the positive numbers 2^k-640119389 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640119889) 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, 122939 + ... + 128039.

It is an arithmetic number, because the mean of its divisors is an integer number (33589017).

Almost surely, 2^640119389 is an apocalyptic number.

It is an amenable number.

640119389 is a deficient number, since it is larger than the sum of its proper divisors (166017019).

640119389 is a wasteful number, since it uses less digits than its factorization.

640119389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5325 (or 5318 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 640119389 is about 25300.5808036100. The cubic root of 640119389 is about 861.8274593067.

The spelling of 640119389 in words is "six hundred forty million, one hundred nineteen thousand, three hundred eighty-nine".