1223906 has 4 divisors (see below), whose sum is σ = 1835862. Its totient is φ = 611952.

The previous prime is 1223897. The next prime is 1223921. The reversal of 1223906 is 6093221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6093221 = 47 ⋅129643.

It can be written as a sum of positive squares in only one way, i.e., 931225 + 292681 = 965^2 + 541^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305975 + ... + 305978.

2^1223906 is an apocalyptic number.

1223906 is a deficient number, since it is larger than the sum of its proper divisors (611956).

1223906 is an equidigital number, since it uses as much as digits as its factorization.

1223906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611955.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 1223906 is about 1106.3028518448. The cubic root of 1223906 is about 106.9668864255.

The spelling of 1223906 in words is "one million, two hundred twenty-three thousand, nine hundred six".