1690922906 has 8 divisors (see below), whose sum is σ = 2539446420. Its totient is φ = 844440768.

The previous prime is 1690922887. The next prime is 1690922921. The reversal of 1690922906 is 6092290961.

It can be written as a sum of positive squares in 2 ways, for example, as 1689621025 + 1301881 = 41105^2 + 1141^2 .

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

It is a Curzon number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 508271 + ... + 511586.

Almost surely, 2^1690922906 is an apocalyptic number.

1690922906 is a deficient number, since it is larger than the sum of its proper divisors (848523514).

1690922906 is a wasteful number, since it uses less digits than its factorization.

1690922906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1020688.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 1690922906 is about 41120.8329925355. The cubic root of 1690922906 is about 1191.3552119321.

The spelling of 1690922906 in words is "one billion, six hundred ninety million, nine hundred twenty-two thousand, nine hundred six".