1240533540 has 72 divisors (see below), whose sum is σ = 3782757888. Its totient is φ = 329067840.

The previous prime is 1240533527. The next prime is 1240533559. The reversal of 1240533540 is 453350421.

1240533540 is a `hidden beast` number, since 124 + 0 + 533 + 5 + 4 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16339 + ... + 52421.

It is an arithmetic number, because the mean of its divisors is an integer number (52538304).

Almost surely, 2^1240533540 is an apocalyptic number.

1240533540 is a gapful number since it is divisible by the number (10) 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 1240533540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1891378944).

1240533540 is an abundant number, since it is smaller than the sum of its proper divisors (2542224348).

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

1240533540 is a wasteful number, since it uses less digits than its factorization.

1240533540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36289 (or 36284 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 1240533540 is about 35221.2086675060. The cubic root of 1240533540 is about 1074.4911354000.

Adding to 1240533540 its reverse (453350421), we get a palindrome (1693883961).

The spelling of 1240533540 in words is "one billion, two hundred forty million, five hundred thirty-three thousand, five hundred forty".