2040421997 has 6 divisors (see below), whose sum is σ = 2044617834. Its totient is φ = 2036234720.

The previous prime is 2040421993. The next prime is 2040422009. The reversal of 2040421997 is 7991240402.

It can be written as a sum of positive squares in 3 ways, for example, as 366875716 + 1673546281 = 19154^2 + 40909^2 .

It is not a de Polignac number, because 2040421997 - 2² = 2040421993 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2040421997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2040421993) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 267683 + ... + 275199.

It is an arithmetic number, because the mean of its divisors is an integer number (340769639).

Almost surely, 2^2040421997 is an apocalyptic number.

It is an amenable number.

2040421997 is a deficient number, since it is larger than the sum of its proper divisors (4195837).

2040421997 is an frugal number, since it uses more digits than its factorization.

2040421997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8559 (or 8038 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 2040421997 is about 45171.0305062880. The cubic root of 2040421997 is about 1268.3525866954.

The spelling of 2040421997 in words is "two billion, forty million, four hundred twenty-one thousand, nine hundred ninety-seven".