406638149 has 2 divisors, whose sum is σ = 406638150. Its totient is φ = 406638148.

The previous prime is 406638131. The next prime is 406638157. The reversal of 406638149 is 941836604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 403809025 + 2829124 = 20095^2 + 1682^2 .

It is a cyclic number.

It is not a de Polignac number, because 406638149 - 2²⁰ = 405589573 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 (406638109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203319074 + 203319075.

It is an arithmetic number, because the mean of its divisors is an integer number (203319075).

Almost surely, 2^406638149 is an apocalyptic number.

It is an amenable number.

406638149 is a deficient number, since it is larger than the sum of its proper divisors (1).

406638149 is an equidigital number, since it uses as much as digits as its factorization.

406638149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 406638149 is about 20165.2708635416. The cubic root of 406638149 is about 740.8598168685.

The spelling of 406638149 in words is "four hundred six million, six hundred thirty-eight thousand, one hundred forty-nine".