1243698660 has 36 divisors (see below), whose sum is σ = 3772553148. Its totient is φ = 331652928.

The previous prime is 1243698647. The next prime is 1243698661. The reversal of 1243698660 is 668963421.

It can be written as a sum of positive squares in 2 ways, for example, as 222129216 + 1021569444 = 14904^2 + 31962^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1243698661) 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 11 ways as a sum of consecutive naturals, for example, 3454539 + ... + 3454898.

It is an arithmetic number, because the mean of its divisors is an integer number (104793143).

Almost surely, 2^1243698660 is an apocalyptic number.

1243698660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243698660 is an abundant number, since it is smaller than the sum of its proper divisors (2528854488).

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

1243698660 is a wasteful number, since it uses less digits than its factorization.

1243698660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6909452 (or 6909447 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The square root of 1243698660 is about 35266.1120624318. The cubic root of 1243698660 is about 1075.4041847718.

The spelling of 1243698660 in words is "one billion, two hundred forty-three million, six hundred ninety-eight thousand, six hundred sixty".