406849 has 4 divisors (see below), whose sum is σ = 408240. Its totient is φ = 405460.

The previous prime is 406837. The next prime is 406859. The reversal of 406849 is 948604.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 406849 - 2⁵ = 406817 is a prime.

It is a super-2 number, since 2×406849² = 331052217602, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 406849.

It is not an unprimeable number, because it can be changed into a prime (406859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67 + ... + 904.

It is an arithmetic number, because the mean of its divisors is an integer number (102060).

2⁴⁰⁶⁸⁴⁹ is an apocalyptic number.

It is an amenable number.

406849 is a deficient number, since it is larger than the sum of its proper divisors (1391).

406849 is an equidigital number, since it uses as much as digits as its factorization.

406849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1390.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 406849 is about 637.8471603762. The cubic root of 406849 is about 74.0987845553.

It can be divided in two parts, 40 and 6849, that added together give a square (6889 = 83²).

The spelling of 406849 in words is "four hundred six thousand, eight hundred forty-nine".