1640702109 has 8 divisors (see below), whose sum is σ = 2238477472. Its totient is φ = 1068364080.

The previous prime is 1640702101. The next prime is 1640702123. The reversal of 1640702109 is 9012070461.

It is a happy number.

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

It is not a de Polignac number, because 1640702109 - 2³ = 1640702101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640702101) 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, 6359182 + ... + 6359439.

It is an arithmetic number, because the mean of its divisors is an integer number (279809684).

Almost surely, 2^1640702109 is an apocalyptic number.

It is an amenable number.

1640702109 is a deficient number, since it is larger than the sum of its proper divisors (597775363).

1640702109 is a wasteful number, since it uses less digits than its factorization.

1640702109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12718667.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 1640702109 is about 40505.5812080261. The cubic root of 1640702109 is about 1179.4419723346.

The spelling of 1640702109 in words is "one billion, six hundred forty million, seven hundred two thousand, one hundred nine".