1678711986 has 32 divisors (see below), whose sum is σ = 4263396480. Its totient is φ = 479631888.

The previous prime is 1678711967. The next prime is 1678712027. The reversal of 1678711986 is 6891178761.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2220141 + ... + 2220896.

It is an arithmetic number, because the mean of its divisors is an integer number (133231140).

Almost surely, 2^1678711986 is an apocalyptic number.

1678711986 is an abundant number, since it is smaller than the sum of its proper divisors (2584684494).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1678711986 is a wasteful number, since it uses less digits than its factorization.

1678711986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4441055 (or 4441049 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 54.

The square root of 1678711986 is about 40972.0878891960. The cubic root of 1678711986 is about 1188.4805091224.

The spelling of 1678711986 in words is "one billion, six hundred seventy-eight million, seven hundred eleven thousand, nine hundred eighty-six".