1242189 has 16 divisors (see below), whose sum is σ = 1982400. Its totient is φ = 764208.

The previous prime is 1242181. The next prime is 1242191. The reversal of 1242189 is 9812421.

It is not a de Polignac number, because 1242189 - 2³ = 1242181 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242181) 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 15 ways as a sum of consecutive naturals, for example, 1419 + ... + 2120.

It is an arithmetic number, because the mean of its divisors is an integer number (123900).

2^1242189 is an apocalyptic number.

It is an amenable number.

1242189 is a deficient number, since it is larger than the sum of its proper divisors (740211).

1242189 is a wasteful number, since it uses less digits than its factorization.

1242189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3561 (or 3555 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 1242189 is about 1114.5353291843. The cubic root of 1242189 is about 107.4968883181.

It can be divided in two parts, 1242 and 189, that added together give a triangular number (1431 = T₅₃).

The spelling of 1242189 in words is "one million, two hundred forty-two thousand, one hundred eighty-nine".