84780349 has 2 divisors, whose sum is σ = 84780350. Its totient is φ = 84780348.

The previous prime is 84780331. The next prime is 84780359. The reversal of 84780349 is 94308748.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84548025 + 232324 = 9195^2 + 482^2 .

It is a cyclic number.

It is not a de Polignac number, because 84780349 - 2⁷ = 84780221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84780359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42390174 + 42390175.

It is an arithmetic number, because the mean of its divisors is an integer number (42390175).

Almost surely, 2^84780349 is an apocalyptic number.

It is an amenable number.

84780349 is a deficient number, since it is larger than the sum of its proper divisors (1).

84780349 is an equidigital number, since it uses as much as digits as its factorization.

84780349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 84780349 is about 9207.6245036383. The cubic root of 84780349 is about 439.3039079529.

The spelling of 84780349 in words is "eighty-four million, seven hundred eighty thousand, three hundred forty-nine".