6400418 has 4 divisors (see below), whose sum is σ = 9600630. Its totient is φ = 3200208.

The previous prime is 6400411. The next prime is 6400423. The reversal of 6400418 is 8140046.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 5139289 + 1261129 = 2267^2 + 1123^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6400393 and 6400402.

It is not an unprimeable number, because it can be changed into a prime (6400411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1600103 + ... + 1600106.

Almost surely, 2^6400418 is an apocalyptic number.

6400418 is a deficient number, since it is larger than the sum of its proper divisors (3200212).

6400418 is a wasteful number, since it uses less digits than its factorization.

6400418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3200211.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 6400418 is about 2529.9047412897. The cubic root of 6400418 is about 185.6675953068.

The spelling of 6400418 in words is "six million, four hundred thousand, four hundred eighteen".