404649 has 16 divisors (see below), whose sum is σ = 685440. Its totient is φ = 231120.

The previous prime is 404597. The next prime is 404671. The reversal of 404649 is 946404.

It is not a de Polignac number, because 404649 - 2¹¹ = 402601 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a d-powerful number, because it can be written as 4³ + 0 + 6⁷ + 4³ + 4⁸ + 9⁵ .

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (404699) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 882 + ... + 1259.

It is an arithmetic number, because the mean of its divisors is an integer number (42840).

2⁴⁰⁴⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

404649 is a deficient number, since it is larger than the sum of its proper divisors (280791).

404649 is a wasteful number, since it uses less digits than its factorization.

404649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2157 (or 2151 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 404649 is about 636.1202716468. The cubic root of 404649 is about 73.9649822143.

It can be divided in two parts, 4046 and 49, that added together give a triangular number (4095 = T₉₀).

The spelling of 404649 in words is "four hundred four thousand, six hundred forty-nine".