400087 has 2 divisors, whose sum is σ = 400088. Its totient is φ = 400086.

The previous prime is 400069. The next prime is 400093. The reversal of 400087 is 780004.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400087 - 2¹¹ = 398039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400067) 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 as a sum of consecutive naturals, namely, 200043 + 200044.

It is an arithmetic number, because the mean of its divisors is an integer number (200044).

2⁴⁰⁰⁰⁸⁷ is an apocalyptic number.

400087 is a deficient number, since it is larger than the sum of its proper divisors (1).

400087 is an equidigital number, since it uses as much as digits as its factorization.

400087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 400087 is about 632.5243078333. The cubic root of 400087 is about 73.6859714312.

The spelling of 400087 in words is "four hundred thousand, eighty-seven".