1229990 has 16 divisors (see below), whose sum is σ = 2261952. Its totient is φ = 481344.

The previous prime is 1229981. The next prime is 1229993. The reversal of 1229990 is 999221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1229993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 839 + ... + 1778.

It is an arithmetic number, because the mean of its divisors is an integer number (141372).

2^1229990 is an apocalyptic number.

1229990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1229990 is a deficient number, since it is larger than the sum of its proper divisors (1031962).

1229990 is a wasteful number, since it uses less digits than its factorization.

1229990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2671.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 1229990 is about 1109.0491422836. The cubic root of 1229990 is about 107.1438366048.

The spelling of 1229990 in words is "one million, two hundred twenty-nine thousand, nine hundred ninety".