1001012238 has 12 divisors (see below), whose sum is σ = 2168859888.
Its totient is φ = 333670740.
The previous prime is 1001012237. The next prime is 1001012249. The reversal of 1001012238 is 8322101001.
It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 55611791 = 1001012238 / (1 + 0 + 0 + 1 + 0 + 1 + 2 + 2 + 3 + 8).
It is a Curzon number.
It is a self number, because there is not a number n which added to its sum of digits gives 1001012238.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1001012237) by changing a digit.
It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27805878 + ... + 27805913.
It is an arithmetic number, because the mean of its divisors is an integer number (180738324).
Almost surely, 21001012238 is an apocalyptic number.
1001012238 is a gapful number since it is divisible by the number (18) formed by its first and last digit.
1001012238 is an abundant number, since it is smaller than the sum of its proper divisors (1167847650).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1001012238 is a wasteful number, since it uses less digits than its factorization.
1001012238 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 55611799 (or 55611796 counting only the distinct ones).
The product of its (nonzero) digits is 96, while the sum is 18.
The square root of 1001012238 is about 31638.7774416143.
Note that the first 3 decimals coincide.
The cubic root of 1001012238 is about 1000.3372988833.
Adding to 1001012238 its reverse (8322101001), we get a palindrome (9323113239).
The spelling of 1001012238 in words is "one billion, one million, twelve thousand, two hundred thirty-eight".