1243616 has 24 divisors (see below), whose sum is σ = 2671704. Its totient is φ = 565120.

The previous prime is 1243609. The next prime is 1243631. The reversal of 1243616 is 6163421.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1243591 and 1243600.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1415 + ... + 2118.

It is an arithmetic number, because the mean of its divisors is an integer number (111321).

2^1243616 is an apocalyptic number.

1243616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1243616 is an abundant number, since it is smaller than the sum of its proper divisors (1428088).

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

1243616 is a wasteful number, since it uses less digits than its factorization.

1243616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3554 (or 3546 counting only the distinct ones).

The product of its digits is 864, while the sum is 23.

The square root of 1243616 is about 1115.1753225390. The cubic root of 1243616 is about 107.5380359365.

The spelling of 1243616 in words is "one million, two hundred forty-three thousand, six hundred sixteen".