2061990405 has 16 divisors (see below), whose sum is σ = 3665760960. Its totient is φ = 1099728144.

The previous prime is 2061990379. The next prime is 2061990407. The reversal of 2061990405 is 5040991602.

It is not a de Polignac number, because 2061990405 - 2⁵ = 2061990373 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 2061990405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2061990407) 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, 7636867 + ... + 7637136.

It is an arithmetic number, because the mean of its divisors is an integer number (229110060).

Almost surely, 2^2061990405 is an apocalyptic number.

It is an amenable number.

2061990405 is a deficient number, since it is larger than the sum of its proper divisors (1603770555).

2061990405 is a wasteful number, since it uses less digits than its factorization.

2061990405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15274017 (or 15274011 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 2061990405 is about 45409.1445085679. The cubic root of 2061990405 is about 1272.8059983855.

The spelling of 2061990405 in words is "two billion, sixty-one million, nine hundred ninety thousand, four hundred five".