1378405543 has 4 divisors (see below), whose sum is σ = 1459488240. Its totient is φ = 1297322848.

The previous prime is 1378405541. The next prime is 1378405547. The reversal of 1378405543 is 3455048731.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1378405543 - 2¹ = 1378405541 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1378405496 and 1378405505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378405541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40541323 + ... + 40541356.

It is an arithmetic number, because the mean of its divisors is an integer number (364872060).

Almost surely, 2^1378405543 is an apocalyptic number.

1378405543 is a deficient number, since it is larger than the sum of its proper divisors (81082697).

1378405543 is an equidigital number, since it uses as much as digits as its factorization.

1378405543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81082696.

The product of its (nonzero) digits is 201600, while the sum is 40.

The square root of 1378405543 is about 37126.8843696855. The cubic root of 1378405543 is about 1112.9073320174.

The spelling of 1378405543 in words is "one billion, three hundred seventy-eight million, four hundred five thousand, five hundred forty-three".