6407540 has 12 divisors (see below), whose sum is σ = 13455876. Its totient is φ = 2563008.

The previous prime is 6407519. The next prime is 6407551. The reversal of 6407540 is 457046.

It can be written as a sum of positive squares in 2 ways, for example, as 2999824 + 3407716 = 1732^2 + 1846^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160169 + ... + 160208.

It is an arithmetic number, because the mean of its divisors is an integer number (1121323).

Almost surely, 2^6407540 is an apocalyptic number.

It is an amenable number.

6407540 is an abundant number, since it is smaller than the sum of its proper divisors (7048336).

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

6407540 is a wasteful number, since it uses less digits than its factorization.

6407540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320386 (or 320384 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 6407540 is about 2531.3119128231. The cubic root of 6407540 is about 185.7364363548.

The spelling of 6407540 in words is "six million, four hundred seven thousand, five hundred forty".