1640025289 has 8 divisors (see below), whose sum is σ = 1917903680. Its totient is φ = 1373044176.

The previous prime is 1640025221. The next prime is 1640025293. The reversal of 1640025289 is 9825200461.

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

It is not a de Polignac number, because 1640025289 - 2²¹ = 1637928137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1640025089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2723994 + ... + 2724595.

It is an arithmetic number, because the mean of its divisors is an integer number (239737960).

Almost surely, 2^1640025289 is an apocalyptic number.

It is an amenable number.

1640025289 is a deficient number, since it is larger than the sum of its proper divisors (277878391).

1640025289 is an equidigital number, since it uses as much as digits as its factorization.

1640025289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5448639.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 1640025289 is about 40497.2256951016. The cubic root of 1640025289 is about 1179.2797694777.

The spelling of 1640025289 in words is "one billion, six hundred forty million, twenty-five thousand, two hundred eighty-nine".