50000018 has 4 divisors (see below), whose sum is σ = 75000030. Its totient is φ = 25000008.

The previous prime is 50000017. The next prime is 50000021. The reversal of 50000018 is 81000005.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 25030009 + 24970009 = 5003^2 + 4997^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 49999957 and 50000011.

It is not an unprimeable number, because it can be changed into a prime (50000017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12500003 + ... + 12500006.

Almost surely, 2^50000018 is an apocalyptic number.

50000018 is a deficient number, since it is larger than the sum of its proper divisors (25000012).

50000018 is a wasteful number, since it uses less digits than its factorization.

50000018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25000011.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 50000018 is about 7071.0690846576. The cubic root of 50000018 is about 368.4031940724.

It can be divided in two parts, 500000 and 18, that multiplied together give a square (9000000 = 3000²).

The spelling of 50000018 in words is "fifty million, eighteen", and thus it is an aban number and an uban number.