1978287018 has 16 divisors (see below), whose sum is σ = 3958331520. Its totient is φ = 659136096.

The previous prime is 1978287013. The next prime is 1978287019. The reversal of 1978287018 is 8107828791.

It is not an unprimeable number, because it can be changed into a prime (1978287013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58363 + ... + 85806.

It is an arithmetic number, because the mean of its divisors is an integer number (247395720).

Almost surely, 2^1978287018 is an apocalyptic number.

1978287018 is an abundant number, since it is smaller than the sum of its proper divisors (1980044502).

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

1978287018 is a wasteful number, since it uses less digits than its factorization.

1978287018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146461.

The product of its (nonzero) digits is 451584, while the sum is 51.

The square root of 1978287018 is about 44477.9385538494. The cubic root of 1978287018 is about 1255.3450092973.

The spelling of 1978287018 in words is "one billion, nine hundred seventy-eight million, two hundred eighty-seven thousand, eighteen".