1905132409 has 8 divisors (see below), whose sum is σ = 1971333000. Its totient is φ = 1838965632.

The previous prime is 1905132407. The next prime is 1905132433. The reversal of 1905132409 is 9042315091.

It can be written as a sum of positive squares in 4 ways, for example, as 103978809 + 1801153600 = 10197^2 + 42440^2 .

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

It is not a de Polignac number, because 1905132409 - 2¹ = 1905132407 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1905132407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171187 + ... + 181975.

It is an arithmetic number, because the mean of its divisors is an integer number (246416625).

Almost surely, 2^1905132409 is an apocalyptic number.

It is an amenable number.

1905132409 is a deficient number, since it is larger than the sum of its proper divisors (66200591).

1905132409 is a wasteful number, since it uses less digits than its factorization.

1905132409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16907.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 1905132409 is about 43647.8225000973. The cubic root of 1905132409 is about 1239.6765565087.

The spelling of 1905132409 in words is "one billion, nine hundred five million, one hundred thirty-two thousand, four hundred nine".