406049821 has 2 divisors, whose sum is σ = 406049822. Its totient is φ = 406049820.

The previous prime is 406049807. The next prime is 406049863. The reversal of 406049821 is 128940604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 378108025 + 27941796 = 19445^2 + 5286^2 .

It is a cyclic number.

It is not a de Polignac number, because 406049821 - 2²³ = 397661213 is a prime.

It is equal to p_21641686 and since 406049821 and 21641686 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (406049221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203024910 + 203024911.

It is an arithmetic number, because the mean of its divisors is an integer number (203024911).

Almost surely, 2^406049821 is an apocalyptic number.

It is an amenable number.

406049821 is a deficient number, since it is larger than the sum of its proper divisors (1).

406049821 is an equidigital number, since it uses as much as digits as its factorization.

406049821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 406049821 is about 20150.6779290425. The cubic root of 406049821 is about 740.5023500389.

The spelling of 406049821 in words is "four hundred six million, forty-nine thousand, eight hundred twenty-one".