1242340 has 24 divisors (see below), whose sum is σ = 2846592. Its totient is φ = 451680.

The previous prime is 1242317. The next prime is 1242347. The reversal of 1242340 is 432421.

It is not an unprimeable number, because it can be changed into a prime (1242347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2604 + ... + 3043.

It is an arithmetic number, because the mean of its divisors is an integer number (118608).

2^1242340 is an apocalyptic number.

1242340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242340 is an abundant number, since it is smaller than the sum of its proper divisors (1604252).

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

1242340 is a wasteful number, since it uses less digits than its factorization.

1242340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5667 (or 5665 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 1242340 is about 1114.6030683611. The cubic root of 1242340 is about 107.5012439012.

Adding to 1242340 its reverse (432421), we get a palindrome (1674761).

The spelling of 1242340 in words is "one million, two hundred forty-two thousand, three hundred forty".