1242855 has 24 divisors (see below), whose sum is σ = 2190240. Its totient is φ = 651840.

The previous prime is 1242841. The next prime is 1242859. The reversal of 1242855 is 5582421.

It is a happy number.

It is not a de Polignac number, because 1242855 - 2⁵ = 1242823 is a prime.

It is a d-powerful number, because it can be written as 1 + 2¹⁶ + 4⁴ + 2¹⁹ + 8⁶ + 5 + 5⁸ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242859) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3001 + ... + 3389.

It is an arithmetic number, because the mean of its divisors is an integer number (91260).

2^1242855 is an apocalyptic number.

1242855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1242855 is a deficient number, since it is larger than the sum of its proper divisors (947385).

1242855 is a wasteful number, since it uses less digits than its factorization.

1242855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471 (or 468 counting only the distinct ones).

The product of its digits is 3200, while the sum is 27.

The square root of 1242855 is about 1114.8340683707. The cubic root of 1242855 is about 107.5160963818.

The spelling of 1242855 in words is "one million, two hundred forty-two thousand, eight hundred fifty-five".