1540400544 has 96 divisors (see below), whose sum is σ = 4499570880. Its totient is φ = 512697600.

The previous prime is 1540400527. The next prime is 1540400611. The reversal of 1540400544 is 4450040451.

It is a tau number, because it is divible by the number of its divisors (96).

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1114734 + ... + 1116114.

It is an arithmetic number, because the mean of its divisors is an integer number (46870530).

Almost surely, 2^1540400544 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 1540400544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2249785440).

1540400544 is an abundant number, since it is smaller than the sum of its proper divisors (2959170336).

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

1540400544 is a wasteful number, since it uses less digits than its factorization.

1540400544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2691 (or 2677 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

The square root of 1540400544 is about 39247.9368120160. The cubic root of 1540400544 is about 1154.9004603035.

Adding to 1540400544 its reverse (4450040451), we get a palindrome (5990440995).

The spelling of 1540400544 in words is "one billion, five hundred forty million, four hundred thousand, five hundred forty-four".