1909986745 has 8 divisors (see below), whose sum is σ = 2315613384. Its totient is φ = 1512236544.

The previous prime is 1909986739. The next prime is 1909986751. The reversal of 1909986745 is 5476899091.

It is an interprime number because it is at equal distance from previous prime (1909986739) and next prime (1909986751).

It can be written as a sum of positive squares in 4 ways, for example, as 58491904 + 1851494841 = 7648^2 + 43029^2 .

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 1909986745 - 2⁹ = 1909986233 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1909986745.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1968574 + ... + 1969543.

It is an arithmetic number, because the mean of its divisors is an integer number (289451673).

Almost surely, 2^1909986745 is an apocalyptic number.

It is an amenable number.

1909986745 is a deficient number, since it is larger than the sum of its proper divisors (405626639).

1909986745 is an equidigital number, since it uses as much as digits as its factorization.

1909986745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3938219.

The product of its (nonzero) digits is 4898880, while the sum is 58.

The square root of 1909986745 is about 43703.3951198302. The cubic root of 1909986745 is about 1240.7285748262.

The spelling of 1909986745 in words is "one billion, nine hundred nine million, nine hundred eighty-six thousand, seven hundred forty-five".