1290242 has 8 divisors (see below), whose sum is σ = 1947456. Its totient is φ = 641092.

The previous prime is 1290209. The next prime is 1290257. The reversal of 1290242 is 2420921.

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

It is an Ulam number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1598 + ... + 2265.

It is an arithmetic number, because the mean of its divisors is an integer number (243432).

2^1290242 is an apocalyptic number.

1290242 is a deficient number, since it is larger than the sum of its proper divisors (657214).

1290242 is a wasteful number, since it uses less digits than its factorization.

1290242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4032.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 1290242 is about 1135.8881987238. Note that the first 3 decimals coincide. The cubic root of 1290242 is about 108.8655301060.

The spelling of 1290242 in words is "one million, two hundred ninety thousand, two hundred forty-two".