1243649 has 8 divisors (see below), whose sum is σ = 1366848. Its totient is φ = 1122160.

The previous prime is 1243643. The next prime is 1243663. The reversal of 1243649 is 9463421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1243649 - 2⁸ = 1243393 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1243643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1499 + ... + 2175.

It is an arithmetic number, because the mean of its divisors is an integer number (170856).

2^1243649 is an apocalyptic number.

It is an amenable number.

1243649 is a deficient number, since it is larger than the sum of its proper divisors (123199).

1243649 is a wasteful number, since it uses less digits than its factorization.

1243649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 855.

The product of its digits is 5184, while the sum is 29.

The square root of 1243649 is about 1115.1901183206. The cubic root of 1243649 is about 107.5389871207.

It can be divided in two parts, 124 and 3649, that added together give a palindrome (3773).

The spelling of 1243649 in words is "one million, two hundred forty-three thousand, six hundred forty-nine".