1543378356 has 72 divisors (see below), whose sum is σ = 4229807400. Its totient is φ = 471677184.

The previous prime is 1543378321. The next prime is 1543378363. The reversal of 1543378356 is 6538733451.

1543378356 is a `hidden beast` number, since 1 + 543 + 3 + 78 + 35 + 6 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1245456 + 1542132900 = 1116^2 + 39270^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58666 + ... + 80798.

It is an arithmetic number, because the mean of its divisors is an integer number (58747325).

Almost surely, 2^1543378356 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 1543378356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2114903700).

1543378356 is an abundant number, since it is smaller than the sum of its proper divisors (2686429044).

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

1543378356 is a wasteful number, since it uses less digits than its factorization.

1543378356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22305 (or 22300 counting only the distinct ones).

The product of its digits is 907200, while the sum is 45.

The square root of 1543378356 is about 39285.8544007891. The cubic root of 1543378356 is about 1155.6441765545.

The spelling of 1543378356 in words is "one billion, five hundred forty-three million, three hundred seventy-eight thousand, three hundred fifty-six".