7801994 has 8 divisors (see below), whose sum is σ = 11762400. Its totient is φ = 3881196.

The previous prime is 7801993. The next prime is 7801999. The reversal of 7801994 is 4991087.

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

It is a super-2 number, since 2×7801994² = 121742220752072, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7801993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9404 + ... + 10199.

It is an arithmetic number, because the mean of its divisors is an integer number (1470300).

Almost surely, 2^7801994 is an apocalyptic number.

7801994 is a deficient number, since it is larger than the sum of its proper divisors (3960406).

7801994 is a wasteful number, since it uses less digits than its factorization.

7801994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19804.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 7801994 is about 2793.2049692065. The cubic root of 7801994 is about 198.3361463402.

The spelling of 7801994 in words is "seven million, eight hundred one thousand, nine hundred ninety-four".