406340 has 24 divisors (see below), whose sum is σ = 931392. Its totient is φ = 147680.

The previous prime is 406339. The next prime is 406349. The reversal of 406340 is 43604.

It is a super-2 number, since 2×406340² = 330224391200, which contains 22 as substring.

It is a zygodrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (406349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 704 + ... + 1143.

It is an arithmetic number, because the mean of its divisors is an integer number (38808).

2⁴⁰⁶³⁴⁰ is an apocalyptic number.

It is an amenable number.

406340 is an abundant number, since it is smaller than the sum of its proper divisors (525052).

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

406340 is a wasteful number, since it uses less digits than its factorization.

406340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1867 (or 1865 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 406340 is about 637.4480370979. The cubic root of 406340 is about 74.0678705299.

Adding to 406340 its reverse (43604), we get a palindrome (449944).

The spelling of 406340 in words is "four hundred six thousand, three hundred forty".