1690708385 has 8 divisors (see below), whose sum is σ = 2029071336. Its totient is φ = 1352419200.

The previous prime is 1690708363. The next prime is 1690708417. The reversal of 1690708385 is 5838070961.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 16589329 + 1674119056 = 4073^2 + 40916^2 .

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

It is not a de Polignac number, because 1690708385 - 2¹² = 1690704289 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75485 + ... + 95285.

It is an arithmetic number, because the mean of its divisors is an integer number (253633917).

Almost surely, 2^1690708385 is an apocalyptic number.

It is an amenable number.

1690708385 is a deficient number, since it is larger than the sum of its proper divisors (338362951).

1690708385 is a wasteful number, since it uses less digits than its factorization.

1690708385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36883.

The product of its (nonzero) digits is 362880, while the sum is 47.

The square root of 1690708385 is about 41118.2244874460. The cubic root of 1690708385 is about 1191.3048288900.

The spelling of 1690708385 in words is "one billion, six hundred ninety million, seven hundred eight thousand, three hundred eighty-five".