1909408745 has 8 divisors (see below), whose sum is σ = 2347175880. Its totient is φ = 1490270080.

The previous prime is 1909408693. The next prime is 1909408789. The reversal of 1909408745 is 5478049091.

It can be written as a sum of positive squares in 4 ways, for example, as 3125824 + 1906282921 = 1768^2 + 43661^2 .

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

It is not a de Polignac number, because 1909408745 - 2⁸ = 1909408489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1909408745.

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, 4656890 + ... + 4657299.

It is an arithmetic number, because the mean of its divisors is an integer number (293396985).

Almost surely, 2^1909408745 is an apocalyptic number.

It is an amenable number.

1909408745 is a deficient number, since it is larger than the sum of its proper divisors (437767135).

1909408745 is an equidigital number, since it uses as much as digits as its factorization.

1909408745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9314235.

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

The square root of 1909408745 is about 43696.7818609105. The cubic root of 1909408745 is about 1240.6034058129.

The spelling of 1909408745 in words is "one billion, nine hundred nine million, four hundred eight thousand, seven hundred forty-five".