2686423781 has 4 divisors (see below), whose sum is σ = 2687094912. Its totient is φ = 2685752652.

The previous prime is 2686423763. The next prime is 2686423799. The reversal of 2686423781 is 1873246862.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (2686423763) and next prime (2686423799).

It is a cyclic number.

It is not a de Polignac number, because 2686423781 - 2⁶ = 2686423717 is a prime.

It is a super-2 number, since 2×2686423781² = 14433745462244671922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2686423721) 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, 329525 + ... + 337578.

It is an arithmetic number, because the mean of its divisors is an integer number (671773728).

Almost surely, 2^2686423781 is an apocalyptic number.

It is an amenable number.

2686423781 is a deficient number, since it is larger than the sum of its proper divisors (671131).

2686423781 is an equidigital number, since it uses as much as digits as its factorization.

2686423781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671130.

The product of its digits is 774144, while the sum is 47.

The square root of 2686423781 is about 51830.7223661797. The cubic root of 2686423781 is about 1390.1388300512.

The spelling of 2686423781 in words is "two billion, six hundred eighty-six million, four hundred twenty-three thousand, seven hundred eighty-one".