1230138 has 48 divisors (see below), whose sum is σ = 3284736. Its totient is φ = 324000.

The previous prime is 1230127. The next prime is 1230167. The reversal of 1230138 is 8310321.

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

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 1230138.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1263 + ... + 2013.

It is an arithmetic number, because the mean of its divisors is an integer number (68432).

2^1230138 is an apocalyptic number.

1230138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1230138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1642368).

1230138 is an abundant number, since it is smaller than the sum of its proper divisors (2054598).

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

1230138 is a wasteful number, since it uses less digits than its factorization.

1230138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 779 (or 776 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1230138 is about 1109.1158641008. The cubic root of 1230138 is about 107.1481338354.

Adding to 1230138 its reverse (8310321), we get a palindrome (9540459).

The spelling of 1230138 in words is "one million, two hundred thirty thousand, one hundred thirty-eight".