77434409 has 4 divisors (see below), whose sum is σ = 83390916. Its totient is φ = 71477904.

The previous prime is 77434397. The next prime is 77434411. The reversal of 77434409 is 90443477.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90443477 = 19 ⋅4760183.

It can be written as a sum of positive squares in 2 ways, for example, as 23088025 + 54346384 = 4805^2 + 7372^2 .

It is a cyclic number.

It is not a de Polignac number, because 77434409 - 2¹² = 77430313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77434429) 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 3 ways as a sum of consecutive naturals, for example, 2978234 + ... + 2978259.

It is an arithmetic number, because the mean of its divisors is an integer number (20847729).

Almost surely, 2^77434409 is an apocalyptic number.

It is an amenable number.

77434409 is a deficient number, since it is larger than the sum of its proper divisors (5956507).

77434409 is a wasteful number, since it uses less digits than its factorization.

77434409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5956506.

The product of its (nonzero) digits is 84672, while the sum is 38.

The square root of 77434409 is about 8799.6823238115. The cubic root of 77434409 is about 426.2306365705.

The spelling of 77434409 in words is "seventy-seven million, four hundred thirty-four thousand, four hundred nine".