2840121997 has 4 divisors (see below), whose sum is σ = 2886681436. Its totient is φ = 2793562560.

The previous prime is 2840121967. The next prime is 2840122001. The reversal of 2840121997 is 7991210482.

It is a happy number.

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 109118916 + 2731003081 = 10446^2 + 52259^2 .

It is a cyclic number.

It is not a de Polignac number, because 2840121997 - 2²⁷ = 2705904269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2840121967) 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, 23279628 + ... + 23279749.

It is an arithmetic number, because the mean of its divisors is an integer number (721670359).

Almost surely, 2^2840121997 is an apocalyptic number.

It is an amenable number.

2840121997 is a deficient number, since it is larger than the sum of its proper divisors (46559439).

2840121997 is an equidigital number, since it uses as much as digits as its factorization.

2840121997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46559438.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 2840121997 is about 53292.7949820611. The cubic root of 2840121997 is about 1416.1600274855.

The spelling of 2840121997 in words is "two billion, eight hundred forty million, one hundred twenty-one thousand, nine hundred ninety-seven".