1206809172 has 48 divisors (see below), whose sum is σ = 3264804480. Its totient is φ = 384778944.

The previous prime is 1206809171. The next prime is 1206809183. The reversal of 1206809172 is 2719086021.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1206809171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 240433 + ... + 245400.

It is an arithmetic number, because the mean of its divisors is an integer number (68016760).

Almost surely, 2^1206809172 is an apocalyptic number.

1206809172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1206809172 is an abundant number, since it is smaller than the sum of its proper divisors (2057995308).

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

1206809172 is a wasteful number, since it uses less digits than its factorization.

1206809172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485869 (or 485861 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 1206809172 is about 34739.1590571793. The cubic root of 1206809172 is about 1064.6647308081.

The spelling of 1206809172 in words is "one billion, two hundred six million, eight hundred nine thousand, one hundred seventy-two".