1709640623 has 8 divisors (see below), whose sum is σ = 1794659328. Its totient is φ = 1625512504.

The previous prime is 1709640613. The next prime is 1709640677. The reversal of 1709640623 is 3260469071.

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 1709640623 - 2¹⁸ = 1709378479 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 (1709640613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218711 + ... + 226392.

It is an arithmetic number, because the mean of its divisors is an integer number (224332416).

Almost surely, 2^1709640623 is an apocalyptic number.

1709640623 is a deficient number, since it is larger than the sum of its proper divisors (85018705).

1709640623 is a wasteful number, since it uses less digits than its factorization.

1709640623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445293.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 1709640623 is about 41347.8007033022. The cubic root of 1709640623 is about 1195.7350036769.

The spelling of 1709640623 in words is "one billion, seven hundred nine million, six hundred forty thousand, six hundred twenty-three".