1689620639 has 8 divisors (see below), whose sum is σ = 1962651168. Its totient is φ = 1424504160.

The previous prime is 1689620609. The next prime is 1689620659. The reversal of 1689620639 is 9360269861.

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 1689620639 - 2¹² = 1689616543 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 (1689620609) 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, 1978052 + ... + 1978905.

It is an arithmetic number, because the mean of its divisors is an integer number (245331396).

Almost surely, 2^1689620639 is an apocalyptic number.

1689620639 is a deficient number, since it is larger than the sum of its proper divisors (273030529).

1689620639 is an equidigital number, since it uses as much as digits as its factorization.

1689620639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3957025.

The product of its (nonzero) digits is 839808, while the sum is 50.

The square root of 1689620639 is about 41104.9953047072. The cubic root of 1689620639 is about 1191.0492920052.

The spelling of 1689620639 in words is "one billion, six hundred eighty-nine million, six hundred twenty thousand, six hundred thirty-nine".