400159 has 4 divisors (see below), whose sum is σ = 421240. Its totient is φ = 379080.

The previous prime is 400157. The next prime is 400187. The reversal of 400159 is 951004.

400159 = T₅₁₅ + T₅₁₆ + T₅₁₇.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 400159 - 2¹ = 400157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 21061 = 400159 / (4 + 0 + 0 + 1 + 5 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10512 + ... + 10549.

It is an arithmetic number, because the mean of its divisors is an integer number (105310).

2⁴⁰⁰¹⁵⁹ is an apocalyptic number.

400159 is the 517-th centered triangular number.

400159 is a deficient number, since it is larger than the sum of its proper divisors (21081).

400159 is a wasteful number, since it uses less digits than its factorization.

400159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21080.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 400159 is about 632.5812200817. The cubic root of 400159 is about 73.6903913630.

The spelling of 400159 in words is "four hundred thousand, one hundred fifty-nine".