1223890 has 8 divisors (see below), whose sum is σ = 2203020. Its totient is φ = 489552.

The previous prime is 1223879. The next prime is 1223897. The reversal of 1223890 is 983221.

It can be written as a sum of positive squares in 2 ways, for example, as 1194649 + 29241 = 1093^2 + 171^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1223897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61185 + ... + 61204.

2^1223890 is an apocalyptic number.

1223890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1223890 is a deficient number, since it is larger than the sum of its proper divisors (979130).

1223890 is a wasteful number, since it uses less digits than its factorization.

1223890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122396.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1223890 is about 1106.2956205283. The cubic root of 1223890 is about 106.9664203010.

The spelling of 1223890 in words is "one million, two hundred twenty-three thousand, eight hundred ninety".