78198143 has 4 divisors (see below), whose sum is σ = 78216840. Its totient is φ = 78179448.

The previous prime is 78198121. The next prime is 78198149. The reversal of 78198143 is 34189187.

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

It is a cyclic number.

It is not a de Polignac number, because 78198143 - 2⁸ = 78197887 is a prime.

It is a super-2 number, since 2×78198143² = 12229899137296898, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78198143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78198149) 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, 128 + ... + 12506.

It is an arithmetic number, because the mean of its divisors is an integer number (19554210).

Almost surely, 2^78198143 is an apocalyptic number.

78198143 is a deficient number, since it is larger than the sum of its proper divisors (18697).

78198143 is a wasteful number, since it uses less digits than its factorization.

78198143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18696.

The product of its digits is 48384, while the sum is 41.

The square root of 78198143 is about 8842.9713897536. The cubic root of 78198143 is about 427.6273560117.

The spelling of 78198143 in words is "seventy-eight million, one hundred ninety-eight thousand, one hundred forty-three".