1225642 has 8 divisors (see below), whose sum is σ = 2005632. Its totient is φ = 557100.

The previous prime is 1225621. The next prime is 1225643. The reversal of 1225642 is 2465221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (22), and also a Moran number because the ratio is a prime number: 55711 = 1225642 / (1 + 2 + 2 + 5 + 6 + 4 + 2).

It is not an unprimeable number, because it can be changed into a prime (1225643) 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 3 ways as a sum of consecutive naturals, for example, 27834 + ... + 27877.

It is an arithmetic number, because the mean of its divisors is an integer number (250704).

2^1225642 is an apocalyptic number.

1225642 is a deficient number, since it is larger than the sum of its proper divisors (779990).

1225642 is a wasteful number, since it uses less digits than its factorization.

1225642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55724.

The product of its digits is 960, while the sum is 22.

The square root of 1225642 is about 1107.0871691064. The cubic root of 1225642 is about 107.0174368183.

The spelling of 1225642 in words is "one million, two hundred twenty-five thousand, six hundred forty-two".