18409239946 has 8 divisors (see below), whose sum is σ = 27614710980. Its totient is φ = 9204336288.

The previous prime is 18409239941. The next prime is 18409239967. The reversal of 18409239946 is 64993290481.

It can be written as a sum of positive squares in 2 ways, for example, as 18404992225 + 4247721 = 135665^2 + 2061^2 .

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

It is not an unprimeable number, because it can be changed into a prime (18409239941) 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, 48421 + ... + 197896.

Almost surely, 2^18409239946 is an apocalyptic number.

18409239946 is a deficient number, since it is larger than the sum of its proper divisors (9205471034).

18409239946 is a wasteful number, since it uses less digits than its factorization.

18409239946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283688.

The product of its (nonzero) digits is 3359232, while the sum is 55.

The spelling of 18409239946 in words is "eighteen billion, four hundred nine million, two hundred thirty-nine thousand, nine hundred forty-six".