6642949 has 4 divisors (see below), whose sum is σ = 6690880. Its totient is φ = 6595020.

The previous prime is 6642919. The next prime is 6642991. The reversal of 6642949 is 9492466.

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 an emirpimes, since its reverse is a distinct semiprime: 9492466 = 2 ⋅4746233.

It is a cyclic number.

It is not a de Polignac number, because 6642949 - 2⁵ = 6642917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6642919) 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, 23757 + ... + 24034.

It is an arithmetic number, because the mean of its divisors is an integer number (1672720).

Almost surely, 2^6642949 is an apocalyptic number.

It is an amenable number.

6642949 is a deficient number, since it is larger than the sum of its proper divisors (47931).

6642949 is a wasteful number, since it uses less digits than its factorization.

6642949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47930.

The product of its digits is 93312, while the sum is 40.

The square root of 6642949 is about 2577.3918988000. The cubic root of 6642949 is about 187.9837487839.

The spelling of 6642949 in words is "six million, six hundred forty-two thousand, nine hundred forty-nine".