6404749 has 4 divisors (see below), whose sum is σ = 6897436. Its totient is φ = 5912064.

The previous prime is 6404743. The next prime is 6404753. The reversal of 6404749 is 9474046.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 499849 + 5904900 = 707^2 + 2430^2 .

It is a cyclic number.

It is not a de Polignac number, because 6404749 - 2¹¹ = 6402701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6404743) 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, 246324 + ... + 246349.

It is an arithmetic number, because the mean of its divisors is an integer number (1724359).

Almost surely, 2^6404749 is an apocalyptic number.

It is an amenable number.

6404749 is a deficient number, since it is larger than the sum of its proper divisors (492687).

6404749 is a wasteful number, since it uses less digits than its factorization.

6404749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492686.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 6404749 is about 2530.7605576190. The cubic root of 6404749 is about 185.7094647100.

The spelling of 6404749 in words is "six million, four hundred four thousand, seven hundred forty-nine".