78440943 has 32 divisors (see below), whose sum is σ = 124710912. Its totient is φ = 42912000.

The previous prime is 78440933. The next prime is 78440977. The reversal of 78440943 is 34904487.

It is not a de Polignac number, because 78440943 - 2⁴ = 78440927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78440903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65155 + ... + 66347.

It is an arithmetic number, because the mean of its divisors is an integer number (3897216).

Almost surely, 2^78440943 is an apocalyptic number.

78440943 is a deficient number, since it is larger than the sum of its proper divisors (46269969).

78440943 is a wasteful number, since it uses less digits than its factorization.

78440943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1335.

The product of its (nonzero) digits is 96768, while the sum is 39.

The square root of 78440943 is about 8856.6891669517. The cubic root of 78440943 is about 428.0694835076.

The spelling of 78440943 in words is "seventy-eight million, four hundred forty thousand, nine hundred forty-three".