6406745 has 4 divisors (see below), whose sum is σ = 7688100. Its totient is φ = 5125392.

The previous prime is 6406727. The next prime is 6406747. The reversal of 6406745 is 5476046.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2374681 + 4032064 = 1541^2 + 2008^2 .

It is a cyclic number.

It is not a de Polignac number, because 6406745 - 2⁶ = 6406681 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6406747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 640670 + ... + 640679.

It is an arithmetic number, because the mean of its divisors is an integer number (1922025).

Almost surely, 2^6406745 is an apocalyptic number.

It is an amenable number.

6406745 is a deficient number, since it is larger than the sum of its proper divisors (1281355).

6406745 is a wasteful number, since it uses less digits than its factorization.

6406745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281354.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 6406745 is about 2531.1548747558. The cubic root of 6406745 is about 185.7287544377.

The spelling of 6406745 in words is "six million, four hundred six thousand, seven hundred forty-five".