39800018 has 4 divisors (see below), whose sum is σ = 59700030. Its totient is φ = 19900008.

The previous prime is 39800017. The next prime is 39800021. The reversal of 39800018 is 81000893.

It is a happy number.

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., 25230529 + 14569489 = 5023^2 + 3817^2 .

It is not an unprimeable number, because it can be changed into a prime (39800011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9950003 + ... + 9950006.

Almost surely, 2^39800018 is an apocalyptic number.

39800018 is a deficient number, since it is larger than the sum of its proper divisors (19900012).

39800018 is a wasteful number, since it uses less digits than its factorization.

39800018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19900011.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 39800018 is about 6308.7255448307. The cubic root of 39800018 is about 341.4242961898.

The spelling of 39800018 in words is "thirty-nine million, eight hundred thousand, eighteen".