78394429 has 6 divisors (see below), whose sum is σ = 83277434. Its totient is φ = 73782720.

The previous prime is 78394427. The next prime is 78394439. The reversal of 78394429 is 92449387.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 37088100 + 41306329 = 6090^2 + 6427^2 .

It is not a de Polignac number, because 78394429 - 2¹ = 78394427 is a prime.

It is a super-2 number, since 2×78394429² = 12291372996472082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78394423) 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 5 ways as a sum of consecutive naturals, for example, 135342 + ... + 135919.

Almost surely, 2^78394429 is an apocalyptic number.

It is an amenable number.

78394429 is a deficient number, since it is larger than the sum of its proper divisors (4883005).

78394429 is a wasteful number, since it uses less digits than its factorization.

78394429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271295 (or 271278 counting only the distinct ones).

The product of its digits is 435456, while the sum is 46.

The square root of 78394429 is about 8854.0628527247. The cubic root of 78394429 is about 427.9848544004.

The spelling of 78394429 in words is "seventy-eight million, three hundred ninety-four thousand, four hundred twenty-nine".