1213780 has 12 divisors (see below), whose sum is σ = 2548980. Its totient is φ = 485504.

The previous prime is 1213763. The next prime is 1213781. The reversal of 1213780 is 873121.

It can be written as a sum of positive squares in 2 ways, for example, as 595984 + 617796 = 772^2 + 786^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30325 + ... + 30364.

It is an arithmetic number, because the mean of its divisors is an integer number (212415).

2^1213780 is an apocalyptic number.

1213780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213780 is an abundant number, since it is smaller than the sum of its proper divisors (1335200).

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

1213780 is a wasteful number, since it uses less digits than its factorization.

1213780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60698 (or 60696 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 1213780 is about 1101.7168420243. The cubic root of 1213780 is about 106.6710718667.

The spelling of 1213780 in words is "one million, two hundred thirteen thousand, seven hundred eighty".