1801268978 has 8 divisors (see below), whose sum is σ = 2702391168. Its totient is φ = 900471924.

The previous prime is 1801268957. The next prime is 1801268993. The reversal of 1801268978 is 8798621081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1801268978² = 6489139862210328968, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66926 + ... + 89897.

It is an arithmetic number, because the mean of its divisors is an integer number (337798896).

Almost surely, 2^1801268978 is an apocalyptic number.

1801268978 is a deficient number, since it is larger than the sum of its proper divisors (901122190).

1801268978 is a wasteful number, since it uses less digits than its factorization.

1801268978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162568.

The product of its (nonzero) digits is 387072, while the sum is 50.

The square root of 1801268978 is about 42441.3592854894. The cubic root of 1801268978 is about 1216.7261905033.

The spelling of 1801268978 in words is "one billion, eight hundred one million, two hundred sixty-eight thousand, nine hundred seventy-eight".