1219990 has 16 divisors (see below), whose sum is σ = 2311920. Its totient is φ = 462240.

The previous prime is 1219963. The next prime is 1219991. The reversal of 1219990 is 999121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1219991) 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 7 ways as a sum of consecutive naturals, for example, 3021 + ... + 3400.

It is an arithmetic number, because the mean of its divisors is an integer number (144495).

2^1219990 is an apocalyptic number.

1219990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1219990 is a deficient number, since it is larger than the sum of its proper divisors (1091930).

1219990 is a wasteful number, since it uses less digits than its factorization.

1219990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6447.

The product of its (nonzero) digits is 1458, while the sum is 31.

The square root of 1219990 is about 1104.5315749221. The cubic root of 1219990 is about 106.8526810661.

It can be divided in two parts, 1219 and 990, that added together give a square (2209 = 47²).

The spelling of 1219990 in words is "one million, two hundred nineteen thousand, nine hundred ninety".