1243740 has 48 divisors (see below), whose sum is σ = 3669120. Its totient is φ = 313920.

The previous prime is 1243717. The next prime is 1243741. The reversal of 1243740 is 473421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 595 + ... + 1685.

It is an arithmetic number, because the mean of its divisors is an integer number (76440).

2^1243740 is an apocalyptic number.

1243740 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 1243740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1834560).

1243740 is an abundant number, since it is smaller than the sum of its proper divisors (2425380).

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

1243740 is a wasteful number, since it uses less digits than its factorization.

1243740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122 (or 1120 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 1243740 is about 1115.2309177924. The cubic root of 1243740 is about 107.5416099962.

The spelling of 1243740 in words is "one million, two hundred forty-three thousand, seven hundred forty".