1020405543 has 8 divisors (see below), whose sum is σ = 1360690800. Its totient is φ = 680195328.

The previous prime is 1020405541. The next prime is 1020405563. The reversal of 1020405543 is 3455040201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1020405543 - 2¹ = 1020405541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020405541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34893 + ... + 57081.

It is an arithmetic number, because the mean of its divisors is an integer number (170086350).

Almost surely, 2^1020405543 is an apocalyptic number.

1020405543 is a deficient number, since it is larger than the sum of its proper divisors (340285257).

1020405543 is a wasteful number, since it uses less digits than its factorization.

1020405543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37521.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 1020405543 is about 31943.7872363313. The cubic root of 1020405543 is about 1006.7560999858.

Adding to 1020405543 its reverse (3455040201), we get a palindrome (4475445744).

The spelling of 1020405543 in words is "one billion, twenty million, four hundred five thousand, five hundred forty-three".