1213506 has 24 divisors (see below), whose sum is σ = 3005184. Its totient is φ = 346680.

The previous prime is 1213483. The next prime is 1213517. The reversal of 1213506 is 6053121.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4690 + ... + 4941.

It is an arithmetic number, because the mean of its divisors is an integer number (125216).

2^1213506 is an apocalyptic number.

1213506 is an abundant number, since it is smaller than the sum of its proper divisors (1791678).

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

1213506 is a wasteful number, since it uses less digits than its factorization.

1213506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9646 (or 9643 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 1213506 is about 1101.5924836345. The cubic root of 1213506 is about 106.6630445819.

Adding to 1213506 its reverse (6053121), we get a palindrome (7266627).

The spelling of 1213506 in words is "one million, two hundred thirteen thousand, five hundred six".