400849 has 2 divisors, whose sum is σ = 400850. Its totient is φ = 400848.

The previous prime is 400837. The next prime is 400853. The reversal of 400849 is 948004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 368449 + 32400 = 607^2 + 180^2 .

It is a cyclic number.

It is not a de Polignac number, because 400849 - 2⁷ = 400721 is a prime.

It is not a weakly prime, because it can be changed into another prime (400859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200424 + 200425.

It is an arithmetic number, because the mean of its divisors is an integer number (200425).

2⁴⁰⁰⁸⁴⁹ is an apocalyptic number.

It is an amenable number.

400849 is a deficient number, since it is larger than the sum of its proper divisors (1).

400849 is an equidigital number, since it uses as much as digits as its factorization.

400849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 400849 is about 633.1263696925. The cubic root of 400849 is about 73.7327221806.

The spelling of 400849 in words is "four hundred thousand, eight hundred forty-nine".