406778543 has 4 divisors (see below), whose sum is σ = 428187960. Its totient is φ = 385369128.

The previous prime is 406778527. The next prime is 406778549. The reversal of 406778543 is 345877604.

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 406778543 - 2⁴ = 406778527 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 406778494 and 406778503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406778549) 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, 10704680 + ... + 10704717.

It is an arithmetic number, because the mean of its divisors is an integer number (107046990).

Almost surely, 2^406778543 is an apocalyptic number.

406778543 is a deficient number, since it is larger than the sum of its proper divisors (21409417).

406778543 is a wasteful number, since it uses less digits than its factorization.

406778543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21409416.

The product of its (nonzero) digits is 564480, while the sum is 44.

The square root of 406778543 is about 20168.7516470405. The cubic root of 406778543 is about 740.9450689986.

The spelling of 406778543 in words is "four hundred six million, seven hundred seventy-eight thousand, five hundred forty-three".