77490439 has 4 divisors (see below), whose sum is σ = 83451256. Its totient is φ = 71529624.

The previous prime is 77490319. The next prime is 77490461. The reversal of 77490439 is 93409477.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 77490439 - 2¹¹ = 77488391 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77490395 and 77490404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77490499) 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, 2980389 + ... + 2980414.

It is an arithmetic number, because the mean of its divisors is an integer number (20862814).

Almost surely, 2^77490439 is an apocalyptic number.

77490439 is a deficient number, since it is larger than the sum of its proper divisors (5960817).

77490439 is a wasteful number, since it uses less digits than its factorization.

77490439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5960816.

The product of its (nonzero) digits is 190512, while the sum is 43.

The square root of 77490439 is about 8802.8653857707. The cubic root of 77490439 is about 426.3334157918. Note that the first 3 decimals are identical.

The spelling of 77490439 in words is "seventy-seven million, four hundred ninety thousand, four hundred thirty-nine".