406049921 has 2 divisors, whose sum is σ = 406049922. Its totient is φ = 406049920.

The previous prime is 406049863. The next prime is 406049927. The reversal of 406049921 is 129940604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 287675521 + 118374400 = 16961^2 + 10880^2 .

It is a cyclic number.

It is not a de Polignac number, because 406049921 - 2¹⁸ = 405787777 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (406049927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203024960 + 203024961.

It is an arithmetic number, because the mean of its divisors is an integer number (203024961).

Almost surely, 2^406049921 is an apocalyptic number.

It is an amenable number.

406049921 is a deficient number, since it is larger than the sum of its proper divisors (1).

406049921 is an equidigital number, since it uses as much as digits as its factorization.

406049921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 406049921 is about 20150.6804103484. The cubic root of 406049921 is about 740.5024108280.

The spelling of 406049921 in words is "four hundred six million, forty-nine thousand, nine hundred twenty-one".