6619440 has 40 divisors (see below), whose sum is σ = 20521008. Its totient is φ = 1765120.

The previous prime is 6619381. The next prime is 6619441. The reversal of 6619440 is 449166.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 6619398 and 6619407.

It is not an unprimeable number, because it can be changed into a prime (6619441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13551 + ... + 14030.

Almost surely, 2^6619440 is an apocalyptic number.

6619440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6619440 is an abundant number, since it is smaller than the sum of its proper divisors (13901568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6619440 is a wasteful number, since it uses less digits than its factorization.

6619440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27597 (or 27591 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 6619440 is about 2572.8272386618. The cubic root of 6619440 is about 187.7617322543.

It can be divided in two parts, 661 and 9440, that added together give a palindrome (10101).

The spelling of 6619440 in words is "six million, six hundred nineteen thousand, four hundred forty".