1205166400 has 42 divisors (see below), whose sum is σ = 2965466510. Its totient is φ = 482065920.

The previous prime is 1205166377. The next prime is 1205166401. The reversal of 1205166400 is 46615021.

It can be written as a sum of positive squares in 3 ways, for example, as 194435136 + 1010731264 = 13944^2 + 31792^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205166401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 375015 + ... + 378214.

Almost surely, 2^1205166400 is an apocalyptic number.

1205166400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1205166400 is an abundant number, since it is smaller than the sum of its proper divisors (1760300110).

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

1205166400 is an equidigital number, since it uses as much as digits as its factorization.

1205166400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 753251 (or 753236 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1205166400 is about 34715.5066216813. The cubic root of 1205166400 is about 1064.1814189304.

The spelling of 1205166400 in words is "one billion, two hundred five million, one hundred sixty-six thousand, four hundred".