1213500 has 48 divisors (see below), whose sum is σ = 3538080. Its totient is φ = 323200.

The previous prime is 1213483. The next prime is 1213517. The reversal of 1213500 is 53121.

It is an interprime number because it is at equal distance from previous prime (1213483) and next prime (1213517).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1096 + ... + 1904.

It is an arithmetic number, because the mean of its divisors is an integer number (73710).

2^1213500 is an apocalyptic number.

1213500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1213500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1769040).

1213500 is an abundant number, since it is smaller than the sum of its proper divisors (2324580).

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

1213500 is a wasteful number, since it uses less digits than its factorization.

1213500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831 (or 819 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 12.

The square root of 1213500 is about 1101.5897603010. The cubic root of 1213500 is about 106.6628687884.

Adding to 1213500 its reverse (53121), we get a palindrome (1266621).

The spelling of 1213500 in words is "one million, two hundred thirteen thousand, five hundred".