1540544232444 has 96 divisors (see below), whose sum is σ = 4140793466880. Its totient is φ = 436658729472.

The previous prime is 1540544232413. The next prime is 1540544232481. The reversal of 1540544232444 is 4442324450451.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 1540544232396 and 1540544232405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17990322 + ... + 18075750.

It is an arithmetic number, because the mean of its divisors is an integer number (43133265280).

Almost surely, 2^{1540544232444} is an apocalyptic number.

1540544232444 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1540544232444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2070396733440).

1540544232444 is an abundant number, since it is smaller than the sum of its proper divisors (2600249234436).

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

1540544232444 is a wasteful number, since it uses less digits than its factorization.

1540544232444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87147 (or 87145 counting only the distinct ones).

The product of its (nonzero) digits is 1228800, while the sum is 42.

Adding to 1540544232444 its reverse (4442324450451), we get a palindrome (5982868682895).

The spelling of 1540544232444 in words is "one trillion, five hundred forty billion, five hundred forty-four million, two hundred thirty-two thousand, four hundred forty-four".