1225646 has 4 divisors (see below), whose sum is σ = 1838472. Its totient is φ = 612822.

The previous prime is 1225643. The next prime is 1225657. The reversal of 1225646 is 6465221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6465221 = 7 ⋅923603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306410 + ... + 306413.

It is an arithmetic number, because the mean of its divisors is an integer number (459618).

2^1225646 is an apocalyptic number.

1225646 is a deficient number, since it is larger than the sum of its proper divisors (612826).

1225646 is an equidigital number, since it uses as much as digits as its factorization.

1225646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612825.

The product of its digits is 2880, while the sum is 26.

The square root of 1225646 is about 1107.0889756474. The cubic root of 1225646 is about 107.0175532387.

The spelling of 1225646 in words is "one million, two hundred twenty-five thousand, six hundred forty-six".