78395949 has 12 divisors (see below), whose sum is σ = 113505756. Its totient is φ = 52140672.

The previous prime is 78395939. The next prime is 78395951. The reversal of 78395949 is 94959387.

It can be written as a sum of positive squares in 2 ways, for example, as 12299049 + 66096900 = 3507^2 + 8130^2 .

It is not a de Polignac number, because 78395949 - 2⁹ = 78395437 is a prime.

It is a super-2 number, since 2×78395949² = 12291849639221202, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78395895 and 78395904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78395939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6162 + ... + 13955.

It is an arithmetic number, because the mean of its divisors is an integer number (9458813).

Almost surely, 2^78395949 is an apocalyptic number.

It is an amenable number.

78395949 is a deficient number, since it is larger than the sum of its proper divisors (35109807).

78395949 is a wasteful number, since it uses less digits than its factorization.

78395949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20556 (or 20553 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 54.

The square root of 78395949 is about 8854.1486886092. The cubic root of 78395949 is about 427.9876204676.

The spelling of 78395949 in words is "seventy-eight million, three hundred ninety-five thousand, nine hundred forty-nine".