1001199978 has 24 divisors (see below), whose sum is σ = 2179003008. Its totient is φ = 332235432.

The previous prime is 1001199937. The next prime is 1001200007. The reversal of 1001199978 is 8799911001.

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 11 ways as a sum of consecutive naturals, for example, 120700 + ... + 128727.

It is an arithmetic number, because the mean of its divisors is an integer number (90791792).

Almost surely, 2^1001199978 is an apocalyptic number.

1001199978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1001199978 is an abundant number, since it is smaller than the sum of its proper divisors (1177803030).

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

1001199978 is a wasteful number, since it uses less digits than its factorization.

1001199978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249658 (or 249655 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 45.

The square root of 1001199978 is about 31641.7442313157. The cubic root of 1001199978 is about 1000.3998327791.

The spelling of 1001199978 in words is "one billion, one million, one hundred ninety-nine thousand, nine hundred seventy-eight".