1220990 has 8 divisors (see below), whose sum is σ = 2197800. Its totient is φ = 488392.

The previous prime is 1220983. The next prime is 1220993. The reversal of 1220990 is 990221.

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

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220993) 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, 61040 + ... + 61059.

It is an arithmetic number, because the mean of its divisors is an integer number (274725).

2^1220990 is an apocalyptic number.

1220990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1220990 is a deficient number, since it is larger than the sum of its proper divisors (976810).

1220990 is a wasteful number, since it uses less digits than its factorization.

1220990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122106.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 1220990 is about 1104.9841627824. The cubic root of 1220990 is about 106.8818680538.

The spelling of 1220990 in words is "one million, two hundred twenty thousand, nine hundred ninety".