1213740 has 72 divisors (see below), whose sum is σ = 4022928. Its totient is φ = 293760.

The previous prime is 1213721. The next prime is 1213741. The reversal of 1213740 is 473121.

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

It is not an unprimeable number, because it can be changed into a prime (1213741) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1674 + ... + 2286.

It is an arithmetic number, because the mean of its divisors is an integer number (55874).

2^1213740 is an apocalyptic number.

1213740 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 1213740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2011464).

1213740 is an abundant number, since it is smaller than the sum of its proper divisors (2809188).

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

1213740 is a wasteful number, since it uses less digits than its factorization.

1213740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639 (or 634 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 1213740 is about 1101.6986883899. The cubic root of 1213740 is about 106.6699000756.

Adding to 1213740 its reverse (473121), we get a palindrome (1686861).

It can be divided in two parts, 1213 and 740, that added together give a triangular number (1953 = T₆₂).

The spelling of 1213740 in words is "one million, two hundred thirteen thousand, seven hundred forty".