6446749 has 4 divisors (see below), whose sum is σ = 6451840. Its totient is φ = 6441660.

The previous prime is 6446731. The next prime is 6446767. The reversal of 6446749 is 9476446.

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 an interprime number because it is at equal distance from previous prime (6446731) and next prime (6446767).

It is a cyclic number.

It is not a de Polignac number, because 6446749 - 2¹³ = 6438557 is a prime.

It is a Duffinian number.

6446749 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6446789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1012 + ... + 3730.

It is an arithmetic number, because the mean of its divisors is an integer number (1612960).

Almost surely, 2^6446749 is an apocalyptic number.

It is an amenable number.

6446749 is a deficient number, since it is larger than the sum of its proper divisors (5091).

6446749 is a wasteful number, since it uses less digits than its factorization.

6446749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5090.

The product of its digits is 145152, while the sum is 40.

The square root of 6446749 is about 2539.0448991698. The cubic root of 6446749 is about 186.1145188324.

It can be divided in two parts, 64467 and 49, that added together give a square (64516 = 254²).

The spelling of 6446749 in words is "six million, four hundred forty-six thousand, seven hundred forty-nine".