249981203838 has 8 divisors (see below), whose sum is σ = 499962407688. Its totient is φ = 83327067944.

The previous prime is 249981203833. The next prime is 249981203891. The reversal of 249981203838 is 838302189942.

It is a happy number.

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

249981203838 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249981203833) 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, 20831766981 + ... + 20831766992.

It is an arithmetic number, because the mean of its divisors is an integer number (62495300961).

Almost surely, 2^249981203838 is an apocalyptic number.

249981203838 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

249981203838 is a wasteful number, since it uses less digits than its factorization.

249981203838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41663533978.

The product of its (nonzero) digits is 5971968, while the sum is 57.

The spelling of 249981203838 in words is "two hundred forty-nine billion, nine hundred eighty-one million, two hundred three thousand, eight hundred thirty-eight".