1213138 has 4 divisors (see below), whose sum is σ = 1819710. Its totient is φ = 606568.

The previous prime is 1213133. The next prime is 1213141. The reversal of 1213138 is 8313121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8313121 = 491 ⋅16931.

It can be written as a sum of positive squares in only one way, i.e., 1108809 + 104329 = 1053^2 + 323^2 .

It is not an unprimeable number, because it can be changed into a prime (1213133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 303283 + ... + 303286.

2^1213138 is an apocalyptic number.

1213138 is a deficient number, since it is larger than the sum of its proper divisors (606572).

1213138 is an equidigital number, since it uses as much as digits as its factorization.

1213138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606571.

The product of its digits is 144, while the sum is 19.

The square root of 1213138 is about 1101.4254400548. The cubic root of 1213138 is about 106.6522615096.

Adding to 1213138 its reverse (8313121), we get a palindrome (9526259).

The spelling of 1213138 in words is "one million, two hundred thirteen thousand, one hundred thirty-eight".