6402740 has 48 divisors (see below), whose sum is σ = 14515200. Its totient is φ = 2365440.

The previous prime is 6402733. The next prime is 6402751. The reversal of 6402740 is 472046.

It is a Harshad number since it is a multiple of its sum of digits (23).

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 15 ways as a sum of consecutive naturals, for example, 14036 + ... + 14484.

It is an arithmetic number, because the mean of its divisors is an integer number (302400).

Almost surely, 2^6402740 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6402740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7257600).

6402740 is an abundant number, since it is smaller than the sum of its proper divisors (8112460).

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

6402740 is a wasteful number, since it uses less digits than its factorization.

6402740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512 (or 510 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 6402740 is about 2530.3636102347. The cubic root of 6402740 is about 185.6900453005.

Adding to 6402740 its reverse (472046), we get a palindrome (6874786).

The spelling of 6402740 in words is "six million, four hundred two thousand, seven hundred forty".