1225618 has 4 divisors (see below), whose sum is σ = 1838430. Its totient is φ = 612808.

The previous prime is 1225603. The next prime is 1225621. The reversal of 1225618 is 8165221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1225449 + 169 = 1107^2 + 13^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1225592 and 1225601.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306403 + ... + 306406.

2^1225618 is an apocalyptic number.

1225618 is a deficient number, since it is larger than the sum of its proper divisors (612812).

1225618 is an equidigital number, since it uses as much as digits as its factorization.

1225618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612811.

The product of its digits is 960, while the sum is 25.

The square root of 1225618 is about 1107.0763297984. The cubic root of 1225618 is about 107.0167382904.

The spelling of 1225618 in words is "one million, two hundred twenty-five thousand, six hundred eighteen".