2015890809 has 16 divisors (see below), whose sum is σ = 2704037952. Its totient is φ = 1335860928.

The previous prime is 2015890801. The next prime is 2015890853. The reversal of 2015890809 is 9080985102.

It is a happy number.

It is not a de Polignac number, because 2015890809 - 2³ = 2015890801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2015890801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 351882 + ... + 357564.

It is an arithmetic number, because the mean of its divisors is an integer number (169002372).

Almost surely, 2^2015890809 is an apocalyptic number.

It is an amenable number.

2015890809 is a deficient number, since it is larger than the sum of its proper divisors (688147143).

2015890809 is a wasteful number, since it uses less digits than its factorization.

2015890809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6376.

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 2015890809 is about 44898.6726863946. The cubic root of 2015890809 is about 1263.2491119230.

The spelling of 2015890809 in words is "two billion, fifteen million, eight hundred ninety thousand, eight hundred nine".