1978543 has 8 divisors (see below), whose sum is σ = 2304288. Its totient is φ = 1663584.

The previous prime is 1978541. The next prime is 1978567. The reversal of 1978543 is 3458791.

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

It is a cyclic number.

It is not a de Polignac number, because 1978543 - 2¹ = 1978541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978541) 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, 2296 + ... + 3037.

It is an arithmetic number, because the mean of its divisors is an integer number (288036).

2^1978543 is an apocalyptic number.

1978543 is a deficient number, since it is larger than the sum of its proper divisors (325745).

1978543 is an equidigital number, since it uses as much as digits as its factorization.

1978543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5393.

The product of its digits is 30240, while the sum is 37.

The square root of 1978543 is about 1406.6069102631. The cubic root of 1978543 is about 125.5399152413.

The spelling of 1978543 in words is "one million, nine hundred seventy-eight thousand, five hundred forty-three".