1699491906 has 48 divisors (see below), whose sum is σ = 4214281344. Its totient is φ = 484875072.

The previous prime is 1699491817. The next prime is 1699491907. The reversal of 1699491906 is 6091949961.

1699491906 is a `hidden beast` number, since 1 + 69 + 9 + 491 + 90 + 6 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1699491907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 82326 + ... + 100878.

It is an arithmetic number, because the mean of its divisors is an integer number (87797528).

Almost surely, 2^1699491906 is an apocalyptic number.

1699491906 is an abundant number, since it is smaller than the sum of its proper divisors (2514789438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1699491906 is a wasteful number, since it uses less digits than its factorization.

1699491906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19295 (or 19292 counting only the distinct ones).

The product of its (nonzero) digits is 944784, while the sum is 54.

The square root of 1699491906 is about 41224.8942509256. The cubic root of 1699491906 is about 1193.3642777955.

It can be divided in two parts, 16994 and 91906, that added together give a square (108900 = 330²).

The spelling of 1699491906 in words is "one billion, six hundred ninety-nine million, four hundred ninety-one thousand, nine hundred six".