1021873978 has 16 divisors (see below), whose sum is σ = 1632367080. Its totient is φ = 478099456.

The previous prime is 1021873943. The next prime is 1021873991. The reversal of 1021873978 is 8793781201.

It can be written as a sum of positive squares in 4 ways, for example, as 959574529 + 62299449 = 30977^2 + 7893^2 .

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 7 ways as a sum of consecutive naturals, for example, 80983 + ... + 92746.

Almost surely, 2^1021873978 is an apocalyptic number.

1021873978 is a deficient number, since it is larger than the sum of its proper divisors (610493102).

1021873978 is a wasteful number, since it uses less digits than its factorization.

1021873978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173921.

The product of its (nonzero) digits is 169344, while the sum is 46.

The square root of 1021873978 is about 31966.7636460121. The cubic root of 1021873978 is about 1007.2387993458.

The spelling of 1021873978 in words is "one billion, twenty-one million, eight hundred seventy-three thousand, nine hundred seventy-eight".