1154551640 has 64 divisors (see below), whose sum is σ = 2846016000. Its totient is φ = 418042240.

The previous prime is 1154551637. The next prime is 1154551687. The reversal of 1154551640 is 461554511.

It is a junction number, because it is equal to n+sod(n) for n = 1154551597 and 1154551606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99671 + ... + 110649.

It is an arithmetic number, because the mean of its divisors is an integer number (44469000).

Almost surely, 2^1154551640 is an apocalyptic number.

1154551640 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 1154551640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1423008000).

1154551640 is an abundant number, since it is smaller than the sum of its proper divisors (1691464360).

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

1154551640 is a wasteful number, since it uses less digits than its factorization.

1154551640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11240 (or 11236 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 32.

The square root of 1154551640 is about 33978.6939125094. The cubic root of 1154551640 is about 1049.0699670980.

The spelling of 1154551640 in words is "one billion, one hundred fifty-four million, five hundred fifty-one thousand, six hundred forty".