398805 has 16 divisors (see below), whose sum is σ = 696384. Its totient is φ = 193280.

The previous prime is 398771. The next prime is 398813. The reversal of 398805 is 508893.

398805 = T₁₁₀ + T₁₁₁ + ... + T₁₅₄.

398805 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 398805 - 2⁸ = 398549 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an Ulam number.

398805 is strictly pandigital in base 7.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1044 + ... + 1373.

It is an arithmetic number, because the mean of its divisors is an integer number (43524).

2³⁹⁸⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

398805 is a deficient number, since it is larger than the sum of its proper divisors (297579).

398805 is a wasteful number, since it uses less digits than its factorization.

398805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2436.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 398805 is about 631.5100949312. The cubic root of 398805 is about 73.6071831560.

The spelling of 398805 in words is "three hundred ninety-eight thousand, eight hundred five".