1699725906 has 48 divisors (see below), whose sum is σ = 3787227288. Its totient is φ = 550540800.

The previous prime is 1699725893. The next prime is 1699725961. The reversal of 1699725906 is 6095279961.

It can be written as a sum of positive squares in 4 ways, for example, as 1663905681 + 35820225 = 40791^2 + 5985^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 785466 + ... + 787626.

Almost surely, 2^1699725906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1699725906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1893613644).

1699725906 is an abundant number, since it is smaller than the sum of its proper divisors (2087501382).

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

1699725906 is a wasteful number, since it uses less digits than its factorization.

1699725906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3387 (or 3384 counting only the distinct ones).

The product of its (nonzero) digits is 1837080, while the sum is 54.

The square root of 1699725906 is about 41227.7322442067. The cubic root of 1699725906 is about 1193.4190460127.

The spelling of 1699725906 in words is "one billion, six hundred ninety-nine million, seven hundred twenty-five thousand, nine hundred six".