1242755 has 8 divisors (see below), whose sum is σ = 1500000. Its totient is φ = 988416.

The previous prime is 1242739. The next prime is 1242757. The reversal of 1242755 is 5572421.

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 1242755 - 2⁴ = 1242739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1242757) 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, 371 + ... + 1619.

It is an arithmetic number, because the mean of its divisors is an integer number (187500).

2^1242755 is an apocalyptic number.

1242755 is a deficient number, since it is larger than the sum of its proper divisors (257245).

1242755 is a wasteful number, since it uses less digits than its factorization.

1242755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1453.

The product of its digits is 2800, while the sum is 26.

The square root of 1242755 is about 1114.7892177448. The cubic root of 1242755 is about 107.5132127261.

The spelling of 1242755 in words is "one million, two hundred forty-two thousand, seven hundred fifty-five".