1869481409 has 4 divisors (see below), whose sum is σ = 1871192916. Its totient is φ = 1867769904.

The previous prime is 1869481403. The next prime is 1869481441. The reversal of 1869481409 is 9041849681.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 867125809 + 1002355600 = 29447^2 + 31660^2 .

It is a cyclic number.

It is not a de Polignac number, because 1869481409 - 2²⁰ = 1868432833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1869481403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 854114 + ... + 856299.

It is an arithmetic number, because the mean of its divisors is an integer number (467798229).

Almost surely, 2^1869481409 is an apocalyptic number.

It is an amenable number.

1869481409 is a deficient number, since it is larger than the sum of its proper divisors (1711507).

1869481409 is a wasteful number, since it uses less digits than its factorization.

1869481409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1711506.

The product of its (nonzero) digits is 497664, while the sum is 50.

The square root of 1869481409 is about 43237.5000318011. The cubic root of 1869481409 is about 1231.8950691486.

The spelling of 1869481409 in words is "one billion, eight hundred sixty-nine million, four hundred eighty-one thousand, four hundred nine".