405400 has 24 divisors (see below), whose sum is σ = 943020. Its totient is φ = 162080.

The previous prime is 405373. The next prime is 405401. The reversal of 405400 is 4504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 814 + ... + 1213.

2⁴⁰⁵⁴⁰⁰ is an apocalyptic number.

405400 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

405400 is an abundant number, since it is smaller than the sum of its proper divisors (537620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

405400 is a wasteful number, since it uses less digits than its factorization.

405400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2043 (or 2034 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 13.

The square root of 405400 is about 636.7102951893. The cubic root of 405400 is about 74.0107118654.

Adding to 405400 its reverse (4504), we get a palindrome (409904).

It can be divided in two parts, 40 and 5400, that multiplied together give a cube (216000 = 60³).

The spelling of 405400 in words is "four hundred five thousand, four hundred".