1240161263436 has 96 divisors (see below), whose sum is σ = 3181814415360. Its totient is φ = 374205420864.

The previous prime is 1240161263431. The next prime is 1240161263461. The reversal of 1240161263436 is 6343621610421.

It is a junction number, because it is equal to n+sod(n) for n = 1240161263394 and 1240161263403.

It is not an unprimeable number, because it can be changed into a prime (1240161263431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4841205 + ... + 5090931.

It is an arithmetic number, because the mean of its divisors is an integer number (33143900160).

Almost surely, 2^{1240161263436} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1240161263436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1590907207680).

1240161263436 is an abundant number, since it is smaller than the sum of its proper divisors (1941653151924).

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

1240161263436 is a wasteful number, since it uses less digits than its factorization.

1240161263436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250723 (or 250721 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 39.

Adding to 1240161263436 its reverse (6343621610421), we get a palindrome (7583782873857).

The spelling of 1240161263436 in words is "one trillion, two hundred forty billion, one hundred sixty-one million, two hundred sixty-three thousand, four hundred thirty-six".