406999993 has 2 divisors, whose sum is σ = 406999994. Its totient is φ = 406999992.

The previous prime is 406999987. The next prime is 407000047. The reversal of 406999993 is 399999604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 328624384 + 78375609 = 18128^2 + 8853^2 .

It is a cyclic number.

It is not a de Polignac number, because 406999993 - 2¹⁷ = 406868921 is a prime.

It is not a weakly prime, because it can be changed into another prime (406999933) 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 as a sum of consecutive naturals, namely, 203499996 + 203499997.

It is an arithmetic number, because the mean of its divisors is an integer number (203499997).

Almost surely, 2^406999993 is an apocalyptic number.

It is an amenable number.

406999993 is a deficient number, since it is larger than the sum of its proper divisors (1).

406999993 is an equidigital number, since it uses as much as digits as its factorization.

406999993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4251528, while the sum is 58.

The square root of 406999993 is about 20174.2408283435. The cubic root of 406999993 is about 741.0795012934.

The spelling of 406999993 in words is "four hundred six million, nine hundred ninety-nine thousand, nine hundred ninety-three".