400838149 has 2 divisors, whose sum is σ = 400838150. Its totient is φ = 400838148.

The previous prime is 400838143. The next prime is 400838159. The reversal of 400838149 is 941838004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 302133924 + 98704225 = 17382^2 + 9935^2 .

It is a cyclic number.

It is not a de Polignac number, because 400838149 - 2¹¹ = 400836101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400838143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200419074 + 200419075.

It is an arithmetic number, because the mean of its divisors is an integer number (200419075).

Almost surely, 2^400838149 is an apocalyptic number.

It is an amenable number.

400838149 is a deficient number, since it is larger than the sum of its proper divisors (1).

400838149 is an equidigital number, since it uses as much as digits as its factorization.

400838149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 400838149 is about 20020.9427600201. The cubic root of 400838149 is about 737.3205685863.

The spelling of 400838149 in words is "four hundred million, eight hundred thirty-eight thousand, one hundred forty-nine".