84000557 has 2 divisors, whose sum is σ = 84000558. Its totient is φ = 84000556.

The previous prime is 84000551. The next prime is 84000593. The reversal of 84000557 is 75500048.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79459396 + 4541161 = 8914^2 + 2131^2 .

It is a cyclic number.

It is not a de Polignac number, because 84000557 - 2¹² = 83996461 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84000551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42000278 + 42000279.

It is an arithmetic number, because the mean of its divisors is an integer number (42000279).

Almost surely, 2^84000557 is an apocalyptic number.

It is an amenable number.

84000557 is a deficient number, since it is larger than the sum of its proper divisors (1).

84000557 is an equidigital number, since it uses as much as digits as its factorization.

84000557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5600, while the sum is 29.

The square root of 84000557 is about 9165.1817767025. The cubic root of 84000557 is about 437.9528819994.

The spelling of 84000557 in words is "eighty-four million, five hundred fifty-seven", and thus it is an aban number.