77920043 has 2 divisors, whose sum is σ = 77920044. Its totient is φ = 77920042.

The previous prime is 77920033. The next prime is 77920057. The reversal of 77920043 is 34002977.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77920043 - 2²⁴ = 61142827 is a prime.

It is a super-2 number, since 2×77920043² = 12143066202243698, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77919991 and 77920009.

It is not a weakly prime, because it can be changed into another prime (77920033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38960021 + 38960022.

It is an arithmetic number, because the mean of its divisors is an integer number (38960022).

Almost surely, 2^77920043 is an apocalyptic number.

77920043 is a deficient number, since it is larger than the sum of its proper divisors (1).

77920043 is an equidigital number, since it uses as much as digits as its factorization.

77920043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 77920043 is about 8827.2330319302. The cubic root of 77920043 is about 427.1198229689.

The spelling of 77920043 in words is "seventy-seven million, nine hundred twenty thousand, forty-three".