1242105 has 16 divisors (see below), whose sum is σ = 2104704. Its totient is φ = 623360.

The previous prime is 1242103. The next prime is 1242107. The reversal of 1242105 is 5012421.

It is an interprime number because it is at equal distance from previous prime (1242103) and next prime (1242107).

It is not a de Polignac number, because 1242105 - 2¹ = 1242103 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2181 + ... + 2690.

It is an arithmetic number, because the mean of its divisors is an integer number (131544).

2^1242105 is an apocalyptic number.

1242105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1242105 is a deficient number, since it is larger than the sum of its proper divisors (862599).

1242105 is a wasteful number, since it uses less digits than its factorization.

1242105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4896.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 1242105 is about 1114.4976446812. The cubic root of 1242105 is about 107.4944651919.

Adding to 1242105 its reverse (5012421), we get a palindrome (6254526).

The spelling of 1242105 in words is "one million, two hundred forty-two thousand, one hundred five".