1971340678 has 4 divisors (see below), whose sum is σ = 2957011020. Its totient is φ = 985670338.

The previous prime is 1971340667. The next prime is 1971340681. The reversal of 1971340678 is 8760431791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8760431791 = 25601 ⋅342191.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492835168 + ... + 492835171.

It is an arithmetic number, because the mean of its divisors is an integer number (739252755).

Almost surely, 2^1971340678 is an apocalyptic number.

1971340678 is a deficient number, since it is larger than the sum of its proper divisors (985670342).

1971340678 is an equidigital number, since it uses as much as digits as its factorization.

1971340678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 985670341.

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 1971340678 is about 44399.7824093767. The cubic root of 1971340678 is about 1253.8739926482.

The spelling of 1971340678 in words is "one billion, nine hundred seventy-one million, three hundred forty thousand, six hundred seventy-eight".