7801998943 has 4 divisors (see below), whose sum is σ = 7813947528. Its totient is φ = 7790050360.

The previous prime is 7801998923. The next prime is 7801998947. The reversal of 7801998943 is 3498991087.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7801998943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7801998947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5973313 + ... + 5974618.

It is an arithmetic number, because the mean of its divisors is an integer number (1953486882).

Almost surely, 2^7801998943 is an apocalyptic number.

7801998943 is a deficient number, since it is larger than the sum of its proper divisors (11948585).

7801998943 is a wasteful number, since it uses less digits than its factorization.

7801998943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11948584.

The product of its (nonzero) digits is 3919104, while the sum is 58.

The square root of 7801998943 is about 88328.9247245771. The cubic root of 7801998943 is about 1983.3618822590.

The spelling of 7801998943 in words is "seven billion, eight hundred one million, nine hundred ninety-eight thousand, nine hundred forty-three".