1640911389 has 32 divisors (see below), whose sum is σ = 2420264448. Its totient is φ = 982464000.

The previous prime is 1640911387. The next prime is 1640911403. The reversal of 1640911389 is 9831190461.

It is not a de Polignac number, because 1640911389 - 2¹ = 1640911387 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1640911389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640911387) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 687979 + ... + 690359.

It is an arithmetic number, because the mean of its divisors is an integer number (75633264).

Almost surely, 2^1640911389 is an apocalyptic number.

It is an amenable number.

1640911389 is a deficient number, since it is larger than the sum of its proper divisors (779353059).

1640911389 is a wasteful number, since it uses less digits than its factorization.

1640911389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2869.

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 1640911389 is about 40508.1644733503. The cubic root of 1640911389 is about 1179.4921181675.

The spelling of 1640911389 in words is "one billion, six hundred forty million, nine hundred eleven thousand, three hundred eighty-nine".