1012200138 has 20 divisors (see below), whose sum is σ = 2268078450. Its totient is φ = 337399992.

The previous prime is 1012200121. The next prime is 1012200139. The reversal of 1012200138 is 8310022101.

It can be written as a sum of positive squares in only one way, i.e., 990549729 + 21650409 = 31473^2 + 4653^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 1012200138.

It is not an unprimeable number, because it can be changed into a prime (1012200139) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3123913 + ... + 3124236.

Almost surely, 2^1012200138 is an apocalyptic number.

1012200138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1012200138 is an abundant number, since it is smaller than the sum of its proper divisors (1255878312).

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

1012200138 is an equidigital number, since it uses as much as digits as its factorization.

1012200138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6248163 (or 6248154 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 1012200138 is about 31815.0929277285. The cubic root of 1012200138 is about 1004.0502857043.

Adding to 1012200138 its reverse (8310022101), we get a palindrome (9322222239).

The spelling of 1012200138 in words is "one billion, twelve million, two hundred thousand, one hundred thirty-eight".