6398440 has 32 divisors (see below), whose sum is σ = 15156000. Its totient is φ = 2424384.

The previous prime is 6398437. The next prime is 6398453. The reversal of 6398440 is 448936.

It is a junction number, because it is equal to n+sod(n) for n = 6398396 and 6398405.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3450 + ... + 4969.

It is an arithmetic number, because the mean of its divisors is an integer number (473625).

Almost surely, 2^6398440 is an apocalyptic number.

It is an amenable number.

6398440 is an abundant number, since it is smaller than the sum of its proper divisors (8757560).

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

6398440 is a wasteful number, since it uses less digits than its factorization.

6398440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8449 (or 8445 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 6398440 is about 2529.5137872722. The cubic root of 6398440 is about 185.6484669550.

The spelling of 6398440 in words is "six million, three hundred ninety-eight thousand, four hundred forty".