6406919 has 2 divisors, whose sum is σ = 6406920. Its totient is φ = 6406918.

The previous prime is 6406913. The next prime is 6406931. The reversal of 6406919 is 9196046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6406919 - 2²⁰ = 5358343 is a prime.

It is a super-2 number, since 2×6406919² = 82097222145122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is an Ulam number.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6406913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3203459 + 3203460.

It is an arithmetic number, because the mean of its divisors is an integer number (3203460).

Almost surely, 2^6406919 is an apocalyptic number.

6406919 is a deficient number, since it is larger than the sum of its proper divisors (1).

6406919 is an equidigital number, since it uses as much as digits as its factorization.

6406919 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 6406919 is about 2531.1892461845. The cubic root of 6406919 is about 185.7304358173.

The spelling of 6406919 in words is "six million, four hundred six thousand, nine hundred nineteen".