1243161270 has 384 divisors, whose sum is σ = 3962649600. Its totient is φ = 277820928.

The previous prime is 1243161259. The next prime is 1243161277. The reversal of 1243161270 is 721613421.

1243161270 is a `hidden beast` number, since 1 + 2 + 43 + 1 + 612 + 7 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243161277) 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 191 ways as a sum of consecutive naturals, for example, 21070501 + ... + 21070559.

It is an arithmetic number, because the mean of its divisors is an integer number (10319400).

Almost surely, 2^1243161270 is an apocalyptic number.

1243161270 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1243161270, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1981324800).

1243161270 is an abundant number, since it is smaller than the sum of its proper divisors (2719488330).

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

1243161270 is a wasteful number, since it uses less digits than its factorization.

1243161270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146 (or 134 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 1243161270 is about 35258.4921685542. The cubic root of 1243161270 is about 1075.2492719219.

Adding to 1243161270 its reverse (721613421), we get a palindrome (1964774691).

The spelling of 1243161270 in words is "one billion, two hundred forty-three million, one hundred sixty-one thousand, two hundred seventy".