1243240 has 16 divisors (see below), whose sum is σ = 2797380. Its totient is φ = 497280.

The previous prime is 1243211. The next prime is 1243271. The reversal of 1243240 is 423421.

It can be written as a sum of positive squares in 2 ways, for example, as 1205604 + 37636 = 1098^2 + 194^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15501 + ... + 15580.

2^1243240 is an apocalyptic number.

1243240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243240 is an abundant number, since it is smaller than the sum of its proper divisors (1554140).

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

1243240 is a wasteful number, since it uses less digits than its factorization.

1243240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31092 (or 31088 counting only the distinct ones).

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

The square root of 1243240 is about 1115.0067264371. The cubic root of 1243240 is about 107.5271970127.

Adding to 1243240 its reverse (423421), we get a palindrome (1666661).

It can be divided in two parts, 124 and 3240, that added together give a square (3364 = 58²).

The spelling of 1243240 in words is "one million, two hundred forty-three thousand, two hundred forty".