400087871 has 2 divisors, whose sum is σ = 400087872. Its totient is φ = 400087870.

The previous prime is 400087847. The next prime is 400087889. The reversal of 400087871 is 178780004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400087871 - 2¹⁴ = 400071487 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400087801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200043935 + 200043936.

It is an arithmetic number, because the mean of its divisors is an integer number (200043936).

Almost surely, 2^400087871 is an apocalyptic number.

400087871 is a deficient number, since it is larger than the sum of its proper divisors (1).

400087871 is an equidigital number, since it uses as much as digits as its factorization.

400087871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 400087871 is about 20002.1966543677. The cubic root of 400087871 is about 736.8602490331.

The spelling of 400087871 in words is "four hundred million, eighty-seven thousand, eight hundred seventy-one".