1154215540 has 12 divisors (see below), whose sum is σ = 2423852676. Its totient is φ = 461686208.

The previous prime is 1154215523. The next prime is 1154215541. The reversal of 1154215540 is 455124511.

1154215540 is nontrivially palindromic in base 11.

It can be written as a sum of positive squares in 2 ways, for example, as 451647504 + 702568036 = 21252^2 + 26506^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1154215499 and 1154215508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1154215541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28855369 + ... + 28855408.

It is an arithmetic number, because the mean of its divisors is an integer number (201987723).

Almost surely, 2^1154215540 is an apocalyptic number.

1154215540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1154215540 is an abundant number, since it is smaller than the sum of its proper divisors (1269637136).

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

1154215540 is a wasteful number, since it uses less digits than its factorization.

1154215540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57710786 (or 57710784 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 28.

The square root of 1154215540 is about 33973.7478062106. The cubic root of 1154215540 is about 1048.9681594284.

The spelling of 1154215540 in words is "one billion, one hundred fifty-four million, two hundred fifteen thousand, five hundred forty".