1213538 has 8 divisors (see below), whose sum is σ = 1827840. Its totient is φ = 604260.

The previous prime is 1213529. The next prime is 1213547. The reversal of 1213538 is 8353121.

It is an interprime number because it is at equal distance from previous prime (1213529) and next prime (1213547).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 578 + ... + 1661.

It is an arithmetic number, because the mean of its divisors is an integer number (228480).

2^1213538 is an apocalyptic number.

1213538 is a deficient number, since it is larger than the sum of its proper divisors (614302).

1213538 is a wasteful number, since it uses less digits than its factorization.

1213538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2512.

The product of its digits is 720, while the sum is 23.

The square root of 1213538 is about 1101.6070079661. The cubic root of 1213538 is about 106.6639821373.

Adding to 1213538 its reverse (8353121), we get a palindrome (9566659).

The spelling of 1213538 in words is "one million, two hundred thirteen thousand, five hundred thirty-eight".