1540156244 has 72 divisors (see below), whose sum is σ = 3085818120. Its totient is φ = 671292160.

The previous prime is 1540156147. The next prime is 1540156249. The reversal of 1540156244 is 4426510451.

It can be written as a sum of positive squares in 4 ways, for example, as 333427600 + 1206728644 = 18260^2 + 34738^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1540156244.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1540156249) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2764814 + ... + 2765370.

It is an arithmetic number, because the mean of its divisors is an integer number (42858585).

Almost surely, 2^1540156244 is an apocalyptic number.

It is an amenable number.

1540156244 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

1540156244 is a wasteful number, since it uses less digits than its factorization.

1540156244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809 (or 796 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 32.

The square root of 1540156244 is about 39244.8244231007. The cubic root of 1540156244 is about 1154.8394032189.

Adding to 1540156244 its reverse (4426510451), we get a palindrome (5966666695).

The spelling of 1540156244 in words is "one billion, five hundred forty million, one hundred fifty-six thousand, two hundred forty-four".