1978743858 has 32 divisors (see below), whose sum is σ = 4870755456. Its totient is φ = 521866368.

The previous prime is 1978743787. The next prime is 1978743881. The reversal of 1978743858 is 8583478791.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1811491 + ... + 1812582.

It is an arithmetic number, because the mean of its divisors is an integer number (152211108).

Almost surely, 2^1978743858 is an apocalyptic number.

1978743858 is an abundant number, since it is smaller than the sum of its proper divisors (2892011598).

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

1978743858 is a wasteful number, since it uses less digits than its factorization.

1978743858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3624098.

The product of its digits is 13547520, while the sum is 60.

The square root of 1978743858 is about 44483.0738371350. The cubic root of 1978743858 is about 1255.4416329031.

The spelling of 1978743858 in words is "one billion, nine hundred seventy-eight million, seven hundred forty-three thousand, eight hundred fifty-eight".