1205616 has 20 divisors (see below), whose sum is σ = 3114632. Its totient is φ = 401856.

The previous prime is 1205609. The next prime is 1205627. The reversal of 1205616 is 6165021.

It is a happy number.

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1205592 and 1205601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12511 + ... + 12606.

2^1205616 is an apocalyptic number.

1205616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1205616 is an abundant number, since it is smaller than the sum of its proper divisors (1909016).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1205616 is a wasteful number, since it uses less digits than its factorization.

1205616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25128 (or 25122 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 1205616 is about 1098.0054644673. The cubic root of 1205616 is about 106.4313737168.

The spelling of 1205616 in words is "one million, two hundred five thousand, six hundred sixteen".