2040402065 has 24 divisors (see below), whose sum is σ = 2675760120. Its totient is φ = 1492867584.

The previous prime is 2040402061. The next prime is 2040402071. The reversal of 2040402065 is 5602040402.

It can be written as a sum of positive squares in 12 ways, for example, as 1493590609 + 546811456 = 38647^2 + 23384^2 .

It is not a de Polignac number, because 2040402065 - 2² = 2040402061 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2040402065.

It is not an unprimeable number, because it can be changed into a prime (2040402061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81029 + ... + 103181.

It is an arithmetic number, because the mean of its divisors is an integer number (111490005).

Almost surely, 2^2040402065 is an apocalyptic number.

It is an amenable number.

2040402065 is a deficient number, since it is larger than the sum of its proper divisors (635358055).

2040402065 is a wasteful number, since it uses less digits than its factorization.

2040402065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22293 (or 22280 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 2040402065 is about 45170.8098776190. The cubic root of 2040402065 is about 1268.3484566860.

Adding to 2040402065 its reverse (5602040402), we get a palindrome (7642442467).

The spelling of 2040402065 in words is "two billion, forty million, four hundred two thousand, sixty-five".