1640950189 has 8 divisors (see below), whose sum is σ = 1645207200. Its totient is φ = 1636700400.

The previous prime is 1640950139. The next prime is 1640950229. The reversal of 1640950189 is 9810590461.

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

It is a cyclic number.

It is not a de Polignac number, because 1640950189 - 2⁷ = 1640950061 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 (1640950139) 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, 1058587 + ... + 1060135.

It is an arithmetic number, because the mean of its divisors is an integer number (205650900).

Almost surely, 2^1640950189 is an apocalyptic number.

It is an amenable number.

1640950189 is a deficient number, since it is larger than the sum of its proper divisors (4257011).

1640950189 is a wasteful number, since it uses less digits than its factorization.

1640950189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3611.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 1640950189 is about 40508.6433863194. The cubic root of 1640950189 is about 1179.5014146138.

The spelling of 1640950189 in words is "one billion, six hundred forty million, nine hundred fifty thousand, one hundred eighty-nine".