1640189839 has 8 divisors (see below), whose sum is σ = 1742653440. Its totient is φ = 1539340056.

The previous prime is 1640189821. The next prime is 1640189843. The reversal of 1640189839 is 9389810461.

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 1640189839 - 2¹⁷ = 1640058767 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1640189792 and 1640189801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640189939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 401359 + ... + 405424.

It is an arithmetic number, because the mean of its divisors is an integer number (217831680).

Almost surely, 2^1640189839 is an apocalyptic number.

1640189839 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1640189839 is a deficient number, since it is larger than the sum of its proper divisors (102463601).

1640189839 is a wasteful number, since it uses less digits than its factorization.

1640189839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806909.

The product of its (nonzero) digits is 373248, while the sum is 49.

The square root of 1640189839 is about 40499.2572647944. The cubic root of 1640189839 is about 1179.3192087062.

The spelling of 1640189839 in words is "one billion, six hundred forty million, one hundred eighty-nine thousand, eight hundred thirty-nine".