1978142746 has 16 divisors (see below), whose sum is σ = 3150066240. Its totient is φ = 928428480.

The previous prime is 1978142743. The next prime is 1978142759. The reversal of 1978142746 is 6472418791.

It is a self number, because there is not a number n which added to its sum of digits gives 1978142746.

It is not an unprimeable number, because it can be changed into a prime (1978142741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63870 + ... + 89641.

It is an arithmetic number, because the mean of its divisors is an integer number (196879140).

Almost surely, 2^1978142746 is an apocalyptic number.

1978142746 is a deficient number, since it is larger than the sum of its proper divisors (1171923494).

1978142746 is a wasteful number, since it uses less digits than its factorization.

1978142746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153909.

The product of its digits is 677376, while the sum is 49.

The square root of 1978142746 is about 44476.3166865243. The cubic root of 1978142746 is about 1255.3144920643.

The spelling of 1978142746 in words is "one billion, nine hundred seventy-eight million, one hundred forty-two thousand, seven hundred forty-six".