6439630 has 16 divisors (see below), whose sum is σ = 11965824. Its totient is φ = 2492640.

The previous prime is 6439619. The next prime is 6439639. The reversal of 6439630 is 369346.

6439630 = T₆₂₉ + T₆₃₀ + ... + T₆₅₉.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a junction number, because it is equal to n+sod(n) for n = 6439592 and 6439601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6439639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10077 + ... + 10696.

It is an arithmetic number, because the mean of its divisors is an integer number (747864).

Almost surely, 2^6439630 is an apocalyptic number.

6439630 is a deficient number, since it is larger than the sum of its proper divisors (5526194).

6439630 is a wasteful number, since it uses less digits than its factorization.

6439630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20811.

The product of its (nonzero) digits is 11664, while the sum is 31.

The square root of 6439630 is about 2537.6426068302. The cubic root of 6439630 is about 186.0459862400.

The spelling of 6439630 in words is "six million, four hundred thirty-nine thousand, six hundred thirty".