400871 has 2 divisors, whose sum is σ = 400872. Its totient is φ = 400870.

The previous prime is 400859. The next prime is 400903. The reversal of 400871 is 178004.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400871 - 2¹⁴ = 384487 is a prime.

It is equal to p₃₃₉₂₃ and since 400871 and 33923 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200435 + 200436.

It is an arithmetic number, because the mean of its divisors is an integer number (200436).

2⁴⁰⁰⁸⁷¹ is an apocalyptic number.

400871 is a deficient number, since it is larger than the sum of its proper divisors (1).

400871 is an equidigital number, since it uses as much as digits as its factorization.

400871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 400871 is about 633.1437435528. The cubic root of 400871 is about 73.7340710595.

Adding to 400871 its reverse (178004), we get a palindrome (578875).

The spelling of 400871 in words is "four hundred thousand, eight hundred seventy-one".