2026440257 has 4 divisors (see below), whose sum is σ = 2026539396. Its totient is φ = 2026341120.

The previous prime is 2026440253. The next prime is 2026440281. The reversal of 2026440257 is 7520446202.

It is a Cunningham number, because it is equal to 45016²+1.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1955054656 + 71385601 = 44216^2 + 8449^2 .

It is a cyclic number.

It is not a de Polignac number, because 2026440257 - 2² = 2026440253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2026440253) 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, 6344 + ... + 63977.

It is an arithmetic number, because the mean of its divisors is an integer number (506634849).

Almost surely, 2^2026440257 is an apocalyptic number.

It is an amenable number.

2026440257 is a deficient number, since it is larger than the sum of its proper divisors (99139).

2026440257 is an equidigital number, since it uses as much as digits as its factorization.

2026440257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99138.

The product of its (nonzero) digits is 26880, while the sum is 32.

The square root of 2026440257 is about 45016.0000111072. Note that the first 4 decimals coincide. The cubic root of 2026440257 is about 1265.4488675624.

Adding to 2026440257 its reverse (7520446202), we get a palindrome (9546886459).

The spelling of 2026440257 in words is "two billion, twenty-six million, four hundred forty thousand, two hundred fifty-seven".