17940989461 has 8 divisors (see below), whose sum is σ = 18562181400. Its totient is φ = 17319966720.

The previous prime is 17940989431. The next prime is 17940989477. The reversal of 17940989461 is 16498904971.

It can be written as a sum of positive squares in 4 ways, for example, as 1591531236 + 16349458225 = 39894^2 + 127865^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 17940989461 - 2³¹ = 15793505813 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 17940989396 and 17940989405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17940989401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196341 + ... + 272821.

It is an arithmetic number, because the mean of its divisors is an integer number (2320272675).

Almost surely, 2^17940989461 is an apocalyptic number.

It is an amenable number.

17940989461 is a deficient number, since it is larger than the sum of its proper divisors (621191939).

17940989461 is an equidigital number, since it uses as much as digits as its factorization.

17940989461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84599.

The product of its (nonzero) digits is 3919104, while the sum is 58.

The spelling of 17940989461 in words is "seventeen billion, nine hundred forty million, nine hundred eighty-nine thousand, four hundred sixty-one".