840046547 has 2 divisors, whose sum is σ = 840046548. Its totient is φ = 840046546.

The previous prime is 840046531. The next prime is 840046553. The reversal of 840046547 is 745640048.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 840046547 - 2⁴ = 840046531 is a prime.

It is a super-2 number, since 2×840046547² = 1411356402253246418, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 840046547.

It is not a weakly prime, because it can be changed into another prime (840046507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420023273 + 420023274.

It is an arithmetic number, because the mean of its divisors is an integer number (420023274).

Almost surely, 2^840046547 is an apocalyptic number.

840046547 is a deficient number, since it is larger than the sum of its proper divisors (1).

840046547 is an equidigital number, since it uses as much as digits as its factorization.

840046547 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 107520, while the sum is 38.

The square root of 840046547 is about 28983.5564932946. The cubic root of 840046547 is about 943.5562238765.

The spelling of 840046547 in words is "eight hundred forty million, forty-six thousand, five hundred forty-seven".