6404149 has 4 divisors (see below), whose sum is σ = 6525036. Its totient is φ = 6283264.

The previous prime is 6404141. The next prime is 6404161. The reversal of 6404149 is 9414046.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9414046 = 2 ⋅4707023.

It can be written as a sum of positive squares in 2 ways, for example, as 4485924 + 1918225 = 2118^2 + 1385^2 .

It is a cyclic number.

It is not a de Polignac number, because 6404149 - 2³ = 6404141 is a prime.

It is a Duffinian number.

6404149 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6404141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60364 + ... + 60469.

It is an arithmetic number, because the mean of its divisors is an integer number (1631259).

Almost surely, 2^6404149 is an apocalyptic number.

It is an amenable number.

6404149 is a deficient number, since it is larger than the sum of its proper divisors (120887).

6404149 is a wasteful number, since it uses less digits than its factorization.

6404149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120886.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 6404149 is about 2530.6420134029. The cubic root of 6404149 is about 185.7036654113.

It can be divided in two parts, 640 and 4149, that multiplied together give a triangular number (2655360 = T₂₃₀₄).

The spelling of 6404149 in words is "six million, four hundred four thousand, one hundred forty-nine".