1225942 has 4 divisors (see below), whose sum is σ = 1838916. Its totient is φ = 612970.

The previous prime is 1225933. The next prime is 1225949. The reversal of 1225942 is 2495221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2495221 = 31 ⋅80491.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225949) 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 as a sum of consecutive naturals, namely, 306484 + ... + 306487.

It is an arithmetic number, because the mean of its divisors is an integer number (459729).

2^1225942 is an apocalyptic number.

1225942 is a deficient number, since it is larger than the sum of its proper divisors (612974).

1225942 is an equidigital number, since it uses as much as digits as its factorization.

1225942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612973.

The product of its digits is 1440, while the sum is 25.

The square root of 1225942 is about 1107.2226515024. Note that the first 3 decimals coincide. The cubic root of 1225942 is about 107.0261676472.

The spelling of 1225942 in words is "one million, two hundred twenty-five thousand, nine hundred forty-two".