6409040 has 40 divisors (see below), whose sum is σ = 16257888. Its totient is φ = 2330240.

The previous prime is 6409037. The next prime is 6409043. The reversal of 6409040 is 409046.

It is an interprime number because it is at equal distance from previous prime (6409037) and next prime (6409043).

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

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 6408997 and 6409015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6409043) 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, 2762 + ... + 4521.

Almost surely, 2^6409040 is an apocalyptic number.

It is an amenable number.

6409040 is an abundant number, since it is smaller than the sum of its proper divisors (9848848).

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

6409040 is a wasteful number, since it uses less digits than its factorization.

6409040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7307 (or 7301 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 6409040 is about 2531.6081845341. The cubic root of 6409040 is about 185.7509288078.

The spelling of 6409040 in words is "six million, four hundred nine thousand, forty".