1978571 has 12 divisors (see below), whose sum is σ = 2325600. Its totient is φ = 1678320.

The previous prime is 1978567. The next prime is 1978589. The reversal of 1978571 is 1758791.

It is not a de Polignac number, because 1978571 - 2² = 1978567 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1978531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7166 + ... + 7436.

It is an arithmetic number, because the mean of its divisors is an integer number (193800).

2^1978571 is an apocalyptic number.

1978571 is a deficient number, since it is larger than the sum of its proper divisors (347029).

1978571 is a wasteful number, since it uses less digits than its factorization.

1978571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434 (or 427 counting only the distinct ones).

The product of its digits is 17640, while the sum is 38.

The square root of 1978571 is about 1406.6168632574. The cubic root of 1978571 is about 125.5405074449.

The spelling of 1978571 in words is "one million, nine hundred seventy-eight thousand, five hundred seventy-one".