7888400243 has 4 divisors (see below), whose sum is σ = 7889256768. Its totient is φ = 7887543720.

The previous prime is 7888400237. The next prime is 7888400249. The reversal of 7888400243 is 3420048887.

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

It is an interprime number because it is at equal distance from previous prime (7888400237) and next prime (7888400249).

It is a cyclic number.

It is not a de Polignac number, because 7888400243 - 2⁴ = 7888400227 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7888400194 and 7888400203.

It is not an unprimeable number, because it can be changed into a prime (7888400249) 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, 414296 + ... + 432917.

It is an arithmetic number, because the mean of its divisors is an integer number (1972314192).

Almost surely, 2^7888400243 is an apocalyptic number.

7888400243 is a deficient number, since it is larger than the sum of its proper divisors (856525).

7888400243 is an equidigital number, since it uses as much as digits as its factorization.

7888400243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856524.

The product of its (nonzero) digits is 344064, while the sum is 44.

The square root of 7888400243 is about 88816.6664708826. Note that the first 3 decimals coincide. The cubic root of 7888400243 is about 1990.6564371427.

The spelling of 7888400243 in words is "seven billion, eight hundred eighty-eight million, four hundred thousand, two hundred forty-three".