19340681 has 4 divisors (see below), whose sum is σ = 19350912. Its totient is φ = 19330452.

The previous prime is 19340663. The next prime is 19340719. The reversal of 19340681 is 18604391.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 18604391 = 13 ⋅1431107.

It is a cyclic number.

It is not a de Polignac number, because 19340681 - 2¹⁰ = 19339657 is a prime.

It is a super-4 number, since 4×19340681⁴ (a number of 30 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19340281) 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, 1361 + ... + 6366.

It is an arithmetic number, because the mean of its divisors is an integer number (4837728).

Almost surely, 2^19340681 is an apocalyptic number.

It is an amenable number.

19340681 is a deficient number, since it is larger than the sum of its proper divisors (10231).

19340681 is an equidigital number, since it uses as much as digits as its factorization.

19340681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10230.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 19340681 is about 4397.8041111446. The cubic root of 19340681 is about 268.4255926298.

The spelling of 19340681 in words is "nineteen million, three hundred forty thousand, six hundred eighty-one".