403855 has 12 divisors (see below), whose sum is σ = 506520. Its totient is φ = 309024.

The previous prime is 403849. The next prime is 403861. The reversal of 403855 is 558304.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (403849) and next prime (403861).

It is not a de Polignac number, because 403855 - 2¹⁵ = 371087 is a prime.

It is a super-2 number, since 2×403855² = 326197722050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6816 + ... + 6874.

It is an arithmetic number, because the mean of its divisors is an integer number (42210).

2⁴⁰³⁸⁵⁵ is an apocalyptic number.

403855 is a deficient number, since it is larger than the sum of its proper divisors (102665).

403855 is an equidigital number, since it uses as much as digits as its factorization.

403855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138 (or 101 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 403855 is about 635.4958693808. The cubic root of 403855 is about 73.9165726463.

Subtracting 403855 from its reverse (558304), we obtain a square (154449 = 393²).

The spelling of 403855 in words is "four hundred three thousand, eight hundred fifty-five".