1680619949 has 8 divisors (see below), whose sum is σ = 1792284480. Its totient is φ = 1570378176.

The previous prime is 1680619931. The next prime is 1680619973. The reversal of 1680619949 is 9499160861.

It is a happy number.

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 1680619949 - 2²⁰ = 1679571373 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1680619949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680619909) 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, 353249 + ... + 357974.

It is an arithmetic number, because the mean of its divisors is an integer number (224035560).

Almost surely, 2^1680619949 is an apocalyptic number.

It is an amenable number.

1680619949 is a deficient number, since it is larger than the sum of its proper divisors (111664531).

1680619949 is a wasteful number, since it uses less digits than its factorization.

1680619949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711379.

The product of its (nonzero) digits is 839808, while the sum is 53.

The square root of 1680619949 is about 40995.3649697133. The cubic root of 1680619949 is about 1188.9305998898.

The spelling of 1680619949 in words is "one billion, six hundred eighty million, six hundred nineteen thousand, nine hundred forty-nine".