1242749 has 4 divisors (see below), whose sum is σ = 1258560. Its totient is φ = 1226940.

The previous prime is 1242739. The next prime is 1242757. The reversal of 1242749 is 9472421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7787 + ... + 7944.

It is an arithmetic number, because the mean of its divisors is an integer number (314640).

2^1242749 is an apocalyptic number.

It is an amenable number.

1242749 is a deficient number, since it is larger than the sum of its proper divisors (15811).

1242749 is an equidigital number, since it uses as much as digits as its factorization.

1242749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15810.

The product of its digits is 4032, while the sum is 29.

The square root of 1242749 is about 1114.7865266498. The cubic root of 1242749 is about 107.5130397018.

It can be divided in two parts, 1242 and 749, that added together give a palindrome (1991).

The spelling of 1242749 in words is "one million, two hundred forty-two thousand, seven hundred forty-nine".