6406140 has 96 divisors (see below), whose sum is σ = 19869696. Its totient is φ = 1532160.

The previous prime is 6406123. The next prime is 6406151. The reversal of 6406140 is 416046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33445 + ... + 33635.

It is an arithmetic number, because the mean of its divisors is an integer number (206976).

Almost surely, 2^6406140 is an apocalyptic number.

6406140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6406140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9934848).

6406140 is an abundant number, since it is smaller than the sum of its proper divisors (13463556).

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

6406140 is a wasteful number, since it uses less digits than its factorization.

6406140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259 (or 257 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 6406140 is about 2531.0353612702. The cubic root of 6406140 is about 185.7229080246.

The spelling of 6406140 in words is "six million, four hundred six thousand, one hundred forty".